Here is the thing about Alaska weather: there is no such thing. The state is bigger than Texas, California, and Montana combined. In addition, it crosses six climate zones. So the weather in Ketchikan on any given day has almost nothing in common with the weather in Utqiagvik 1,400 miles to the north. For instance, people show up in July thinking they need a parka. Meanwhile, other people show up in October in shorts. Both make the same mistake. In short, they are planning for a state, not a region.
I have spent the better part of two decades working television shoots in every corner of this place. Port Protection in the Tongass rainforest, where the rain is part of the lighting. Staging in Fairbanks for The Last Alaskans before flying north into ANWR, gearing up in cold that makes every other Alaska shoot feel mild by comparison. A week on Adak in the Aleutians, where the wind never actually stops, just changes direction. Airplane Repo days out of Talkeetna and near Wasilla, where the bush pilots taught me how the Mat-Su weather can scrub a flight plan in under an hour.
So we break it down the way it actually works. Region by region.
For the timing question (when to come for what activity), pair the regional weather below with our Best Time to Visit Alaska guide. For what to put in your bag once you have a region in mind, we have the Rain Gear Alaska guide and the complete packing list.
Quick Picks: Alaska Weather at a Glance
The 30-second cheat sheet.
- Wettest region: Southeast Alaska (Yakutat, Ketchikan, Prince of Wales). Up to 200+ inches of precipitation a year in some spots.
- Driest region: The Arctic / North Slope. Less than 5 inches of total precipitation annually. Technically a polar desert.
- Most extreme temperature swings: Interior Alaska. Fairbanks has hit 99°F in summer and 65 below zero in winter, sometimes in the same calendar year.
- Mildest big-city weather: Anchorage. Subarctic but moderated by the coast. Summers in the low 60s, winters that rarely break 0°F.
- Windiest region: Aleutians and the western Bering Sea. Adak gets fall and spring storms with gusts above 100 knots.
- Most surprising: Southeast Alaska gets less snow than Anchorage despite getting more total precipitation. The Gulf of Alaska keeps it too warm.
- The number one mistake: Packing for one Alaska. There is no one Alaska weather. Pack for the region you are visiting.
Table of Contents
- Why Alaska Weather Is So Misunderstood
- The Six Climate Regions of Alaska
- Alaska Weather Phenomena Nobody Warns You About
- Daylight and Why It Changes Everything
- How Alaska Weather Is Changing
- How to Dress for Alaska Weather
- Coming Soon: Alaska Weather Month by Month
- FAQ
- Why Trust Us on Alaska Weather
- Keep Exploring Alaska
Why Alaska Weather Is So Misunderstood
Most travelers think of Alaska as one big cold place. Snow. Bears. Northern lights. Done.
In reality, Alaska contains, depending on how you count, between five and six distinct climate zones. The U.S. Climate Center officially recognizes a maritime zone, a maritime-continental transition zone, a transition zone (Cook Inlet and Copper River area), a continental zone (the Interior), and an Arctic zone. In addition, you can also break out the Aleutian and Bering Sea coastal areas as their own regime because the weather there is so different from anywhere else.
For example, a July day in Juneau can be 60°F and raining. Meanwhile, the same day in Fort Yukon, 700 miles to the north and inland, can be 88°F and bone dry. The same day in Utqiagvik, 700 miles north of that, can be 38°F with a cold rain blowing horizontal off the Beaufort Sea. Three coats. Three regions. One state.
In short, the single biggest cause of bad Alaska trips is people who packed for the wrong region.
The Six Climate Regions of Alaska
This is the heart of the guide. So pick the region you are visiting and read its section closely. Then read the others, because half the people who think they are only going to one region end up in two.
1. Southeast Alaska (The Panhandle: Juneau, Ketchikan, Sitka, Prince of Wales)
The short version: It rains. A lot. Always. Get over it.
Southeast is a temperate rainforest, classified as oceanic (Köppen Cfb) in the south and subarctic oceanic (Cfc) up by Yakutat and Skagway. The Gulf of Alaska moderates the temperature in both directions. As a result, winters are mild for the latitude and summers are cool. Daily highs in Juneau in July average around 65°F. Meanwhile, daily lows in January average around 22°F. Snow happens but does not stick at sea level the way it does inland.
Just How Much Does It Rain?
The rain is the headline. Ketchikan averages around 140 inches of rain a year and has cleared 200 in wet years. Likewise, Yakutat sits at about 160 inches of total precipitation, with another 170+ inches of snow on top of that. Some pockets along the Coastal Range push past 275 inches. For perspective, Seattle gets around 38 inches. In other words, the Inside Passage gets four to seven Seattles, every year, forever.
I spent years on Prince of Wales Island filming National Geographic’s Port Protection. In Southeast Alaska, the rain is not weather. It is the medium. So you do not wait it out. You work in it, you film in it, you fish in it. The locals do not own umbrellas. Instead, they own rain bibs. If you are visiting Southeast and your plan is to wait for a clear day, your plan is to never leave the cabin.
For more on this region specifically, see our Prince of Wales Island guide.
What to expect: Highs 55-65°F summer, 30-40°F winter. Lows 45-55°F summer, 18-28°F winter. Constant moisture. Overcast 70-75 percent of the time. Best dry stretch is May and June.
2. Southcentral Alaska (Anchorage, Mat-Su, Kenai Peninsula, Homer, Seward)
The short version: Mild for Alaska. Drier than Southeast. The region where most first-time visitors will actually be.
Southcentral sits in a transition zone between the maritime climate to the south and the brutal continental climate of the Interior. Officially, it is a subarctic climate (Köppen Dfc) with short cool summers and cold but tolerable winters. Anchorage averages 16-20 inches of total precipitation annually, which is roughly an eighth of what Ketchikan gets. Days are also clearer.
Anchorage Specifics
Summer in Anchorage runs 55-70°F most days. Winter averages 5-25°F. The city has seen 90°F once (July 4, 2019) and -38°F in cold snaps, but those are outliers. Most of the time, it is mild by Alaska standards.
The Mat-Su Valley Is Not Anchorage
The catch is the Knik wind around Palmer and the upper Mat-Su, which can drive winter wind chills into the negative double digits even when the temperature itself is only in the teens. I spent time filming Airplane Repo out of Talkeetna and around Wasilla, and the wind story up there is not the Anchorage wind story. So the Mat-Su Valley funnels weather in ways the city does not.
Talkeetna itself sits at the base of the Alaska Range. As a result, you get classic Southcentral conditions plus the added curveball of mountain weather rolling down off the Range. Of course, the bush pilots up there spend half their working day watching ceilings.
Kenai Peninsula
Homer, Seward, and the Kenai Peninsula generally get more precipitation than Anchorage because they are closer to the Gulf. Still, they get way less than Southeast. Homer averages around 25 inches a year. For Southcentral itinerary planning, see our 10 Day Alaska Itinerary.
What to expect: Highs 55-70°F summer, 20-30°F winter. Lows 45-55°F summer, 5-15°F winter. Light to moderate precipitation. More clear days than Southeast.
3. Interior Alaska (Fairbanks, Denali, McCarthy)
The short version: The most extreme weather in the state. Hot summers, brutally cold winters, and a 100+ degree annual swing.
The Interior is a textbook continental subarctic climate. Without the Pacific to moderate it, temperatures here do whatever they want. So Fairbanks has hit 99°F in summer and -66°F in winter. Fort Yukon, north of Fairbanks, holds the state high-temperature record of 100°F (June 27, 1915). Meanwhile, Prospect Creek (also in the Interior) holds the state and U.S. low-temperature record at -80°F (January 23, 1971).
Interior Winter Cold
That second number is the one most people cannot believe. Eighty below. With wind chill, the Army’s old chart puts the effective temperature at around -120°F. At that point, exposed skin freezes in under a minute. Diesel gels. Plastic shatters. Trucks have to be plugged in just to start.
Most of my Interior time has been Fairbanks-based, usually as a staging point before flying out to more remote shoots. For example, gearing up in Fairbanks for The Last Alaskans before flying north over the Brooks Range into ANWR, every piece of equipment had to be triple-checked before going outside. Then cameras had to be acclimated slowly on the way back inside or the lenses would fog and the moisture would freeze inside the body. Another Fairbanks shoot for LinkedIn Learning had us covering a dog sled race in cold deep enough that the mushers were running their dogs with paw booties and chest blankets just to make the start.
Interior Summer Heat
Summer in the Interior is the opposite. In fact, Fairbanks regularly hits the upper 80s in July. The midnight sun pumps light for nearly 22 hours a day around the solstice. As a result, the Tanana Valley near Fairbanks can feel almost desert-like in late June.
Precipitation, Inversions, and Ice Fog
Precipitation in the Interior is low. Fairbanks gets about 11 inches of total precipitation a year. Snow makes up most of the winter contribution, with around 65 inches typical. Thunderstorms happen in summer and start most of the wildfires that occasionally smoke out the region for weeks at a time.
The Interior is also where you get temperature inversions and ice fog, covered below. So if you are visiting Fairbanks in January and the temperature is -30°F with no wind, you are in an inversion. The cold is trapped against the ground and there is warmer air sitting on top of it.
For travel into this region, see our Anchorage to McCarthy guide.
What to expect: Highs 65-80°F summer, -10 to 5°F winter. Lows 45-55°F summer, -25 to -10°F winter. Annual swing of 100+ degrees. Low precipitation. Wildfire smoke possible in late summer.
4. Western Alaska and the Bering Sea Coast (Nome, Bethel, Bristol Bay)
The short version: Subarctic maritime in summer, continental cold in winter, wind year-round.
Western Alaska is what climate scientists call a “maritime-continental transition.” In summer, the open water of the Bering Sea keeps things relatively cool and moderate. In winter, however, that same Bering Sea ices over. Once the ice forms, the maritime moderation disappears and the temperatures act like the Interior.
Western Alaska Temperatures and Wind
Nome runs summer highs in the mid-50s°F and winter lows in the single digits below zero. Bethel is similar but slightly colder in winter. Annual precipitation runs around 16-20 inches depending on the town, with most of it coming as wind-driven snow in winter and rain showers in summer.
The wind here is constant. Storm systems track across the Bering and hit the coast with very little to slow them down. As a result, coastal flooding from late-fall storms is a real risk for villages like Shishmaref and Newtok, which have been losing ground to erosion as sea ice forms later and offers less coastline protection.
Bristol Bay in Summer
I spent nearly a month one summer on a king salmon gillnetter in Bristol Bay shooting a show for Animal Planet called Battle on the Bay that I am pretty sure no one ever watched. The weather was the easy part. So was the daylight. The hard part was the chaos of the opener itself, with boats ramming each other competing for setline real estate and captains firing shotguns into the air to warn other crews off their corklines.
Bristol Bay in summer is mostly cool, breezy, and overcast. The temperatures stay in the 50s and 60s. The wind is steady. Of course, the weather you actually have to plan around hits later in the year.
Bering Sea Storms
In fall and winter, the same coast turns into the most dangerous water in commercial fishing. Hurricane-force storms are common in that season. Rogue waves are common. So you do not want to be on a boat out there in October.
What to expect: Highs 50-60°F summer, 5 to 15°F winter. Lows 40-50°F summer, -10 to 0°F winter. Always windy. Coastal storms intensify in fall.
5. The Aleutian Islands (Adak, Dutch Harbor, Unalaska)
The short version: The wind is the weather. Temperatures are mild. You will not see the sun.
The Aleutians are a maritime climate at the extreme. For instance, Adak Airport varies between about 29°F and 56°F across the entire year. It is overcast almost constantly. So there is no summer in the usual sense and no winter in the usual sense. Instead, there is just a band of cool, wet, windy.
What makes the Aleutians distinct is the Aleutian Low, a semi-permanent area of low pressure that sits over the chain for most of the cool season and pumps storm after storm into the islands. Fall and spring are the worst, with windstorms producing sustained gusts that exceed 100 knots. I worked a week on Adak where the wind pinned us to the lee side of buildings just to walk between locations, and one afternoon delivered a windstorm with gusts above 90. In addition, fog in July and August snakes in off the water and cancels passenger flights for days at a time.
The Aleutians are also home to williwaws, which are sudden, violent katabatic winds that come down off the mountains with almost no warning. As a result, fishing crews and pilots in the Aleutians spend half their working life watching for them.
For the full Aleutian experience, see our Adak Alaska piece.
What to expect: Highs 45-55°F summer, 30-38°F winter. Lows 38-45°F summer, 25-32°F winter. Wind. Always. Overcast year-round.
6. Arctic Alaska / The North Slope (Utqiagvik, Kaktovik, Prudhoe Bay)
The short version: Cold, dry, dark in winter, light in summer, wind year-round. Technically a polar desert.
Most people picture Alaska weather and they are actually picturing Arctic Alaska weather. In this part of the state, everything you imagined is true. Polar climate (Köppen ET). Long, dark, brutally cold winters. Short, cool, light-filled summers. Snow possible any month of the year.
Utqiagvik (formerly Barrow) is the northernmost city in the United States. The annual mean temperature is around 11°F. The town sees 65 days of polar night around the winter solstice when the sun does not rise at all. In addition, it sees 84 days of midnight sun in summer when it does not set.
Despite the brutal cold, the Arctic is technically a desert. Total precipitation in Utqiagvik runs around 4-5 inches per year, with another 25-30 inches of snow on top. In fact, less precipitation falls here in a year than falls in Tucson, Arizona. The reason it feels different is that nothing evaporates and the permafrost prevents any drainage. So what little moisture does fall sits on the surface as bogs and snowpack.
Winds along the Arctic coast are strong almost year-round, with prevailing easterlies and storm systems producing 50+ mph gusts on a regular basis. Wind chill is the real story here. For example, -25°F air with 30 mph wind drops effective temperature into the -60s°F.
A Warming Arctic
This is also the part of Alaska that has warmed most dramatically. The North Slope, specifically, is warming at 2 to 4 times the global rate, with cascading effects on sea ice, polar bears, walrus, and the entire Arctic food web.
What to expect: Highs 40-55°F summer, -5 to 10°F winter. Lows 30-40°F summer, -25 to -10°F winter. Wind year-round. Polar night Nov-Jan. Midnight sun May-Aug.
Alaska Weather Phenomena Nobody Warns You About
A few specific things you will hear locals reference that will not be in your guidebook.
Williwaws
Sudden, violent, downsloping winds that hit Aleutian and coastal valleys with almost no warning. A flat-calm bay can go from glass to whitecaps in under a minute when a williwaw rolls off the mountains. For example, anyone working a boat in the Aleutians or the long, narrow fjords of Southeast Alaska tracks these obsessively.
The Knik Wind
A specific southeast wind that funnels through the Knik River valley and slams into Palmer and the upper Mat-Su, especially in winter. Steady speeds of 40-50 mph are normal. As a result, Palmer winter wind chills feel much worse than Anchorage winter wind chills despite being only an hour apart.
Temperature Inversions
In winter in the Interior, cold air settles into valleys while warmer air sits above. For instance, you can drive up a hill outside Fairbanks in January and warm up by 30 degrees in 1,000 vertical feet. Inversions trap pollution and ice fog, which is why the coldest temperatures in the Interior happen in valleys, not on ridges.
Ice Fog
Specific to extreme cold. When temperatures drop below about -30°F, water vapor from car exhaust, chimneys, and human breath freezes instantly in the air as suspended ice crystals. Fairbanks gets it every winter. Visibility drops to a few hundred feet, and the air actually feels solid.
The Aleutian Low
A semi-permanent low-pressure system that sits over the Bering Sea and Aleutians from October through April. It is the engine that drives most of Alaska’s cool-season weather, including storms that track east into Southeast and Southcentral. For example, when you see a forecast in November showing a big blow coming into Anchorage, the Aleutian Low is the why.
Thunderstorms and Tornadoes
Yes, Alaska gets thunderstorms. In the Interior, in summer specifically. They cause most of the wildfires the state experiences. Anchorage, however, gets a thunderstorm maybe once every couple of years. Utqiagvik has even recorded thunderstorms, which is unusual enough to make the news when it happens.
Tornadoes are another story. Alaska is the least tornado-prone state in the United States, and confirmed tornadoes are extraordinarily rare. Waterspouts happen occasionally in coastal waters.
Daylight and Why It Changes Everything
Alaska weather cannot be discussed honestly without the daylight piece, because daylight changes both the actual temperature and how the weather feels.
For example, in Anchorage, summer days run over 19 hours of usable daylight around the solstice. Meanwhile, winter days shrink to under 6 hours. In Fairbanks, the summer solstice produces essentially 22 hours of effective light and a sun that never really sets. By contrast, the winter solstice gives you about 4 hours.
North of the Arctic Circle, you cross into 24-hour daylight from late May through late July and 24-hour darkness from late November through late January. Specifically, Utqiagvik sees the sun set in mid-November and not rise again until late January.
This has practical implications. First, summer daylight means trip-planning windows are huge. You can fish at midnight in late June, drive a backroad at 11 pm in good visibility, and hike a peak in genuinely warm air at 9 in the evening. By contrast, winter darkness means the opposite. You are on a much tighter clock, and any plan that requires daylight needs to factor in that you may only get 3 or 4 hours of it.
In addition, daylight also affects temperature. The clear, dry winters of the Interior produce the coldest temperatures specifically because there is no daylight to warm anything and no cloud cover to trap what little heat the ground releases. Likewise, the clear summer days of the same region produce the hottest temperatures for the same reason. Sunshine has nowhere to lose its energy.
How Alaska Weather Is Changing
Alaska is warming roughly twice as fast as the rest of the United States. Furthermore, the Arctic specifically is warming 2 to 4 times the global rate. Over the last 60 years, the state has seen an average annual temperature increase of about 3°F and an average winter increase of about 6°F.
In practical terms, this means:
- Sea ice is forming later and breaking up earlier. As a result, polar bears and walrus are stranded on shore longer.
- Permafrost is thawing across the Interior and the North Slope, undermining roads, buildings, and entire villages.
- Wildfire seasons are longer and more intense.
- Salmon runs are shifting in timing and pressure on individual watersheds.
- In addition, the number of days per year with temperatures above freezing in Utqiagvik has roughly doubled since the 1970s.
I am not the guy to tell you what to do about it. I am the guy who has watched the state I have worked in for two decades change visibly over the time I have been there. For instance, the Adak I worked is not the Adak the Navy ran in the 1980s. Likewise, the Bristol Bay salmon runs we filmed are not the same runs locals describe from the 1990s. If a specific Alaska experience is on your bucket list, the math on how long you have to do it is not getting longer.
How to Dress for Alaska Weather
A short summary, since the full breakdown lives in our Rain Gear Alaska guide and our complete packing list.
Layers, always. First, a base layer (merino or synthetic, never cotton). Next, a mid layer (fleece or light puffy). Finally, an outer shell (waterproof and windproof). This is non-negotiable in every region.
Waterproof outer shell. Even if you are visiting the Interior in July, you will hit weather. So get a Helly Hansen Impertech, a Grundens Neptune, or a serious Gore-Tex shell. Cheap rain jackets fail.
Boots. Xtratuf is the unofficial state boot. Wear them or buy them when you arrive. In addition, real waterproof hiking boots if you are doing trails.
Bug protection in summer. This is not weather but it might as well be. For example, the Interior and the Arctic in summer can be unwalkable without DEET or a head net. Locals do not joke about this.
For the Interior in winter, you need real expedition gear. Specifically, insulated bibs, a heavy parka, beaver-fur ruff, expedition-grade insulated boots, mittens not gloves. Most visitors are not equipped for serious cold and underestimate it. Do not be that person.
Coming Soon: Alaska Weather Month by Month
We are building out a series of month-by-month Alaska weather guides as companion pieces to this regional pillar. Each one drills into a single month with average conditions by region, what to pack, what is happening for wildlife, and what to expect if you are traveling in that window.
In the meantime, our Best Time to Visit Alaska guide covers the macro question of when to come for what you want to do, and our Summer in Alaska and Winter in Alaska pieces cover those seasons in depth.
FAQ
What is the warmest month in Alaska?
July. Statewide, July is the warmest month in every region. Fairbanks averages around 73°F daily highs in July. Anchorage averages around 65°F. Juneau averages around 64°F. Utqiagvik averages around 47°F.
What is the coldest month in Alaska?
January in most regions. The Interior is the most extreme, with Fairbanks averaging single digits for daily highs and -10 to -20°F for daily lows. Utqiagvik averages around -8°F for the month. Coastal areas are milder. Juneau averages around 33°F.
Does Alaska get a lot of snow?
It depends entirely on the region. The Thompson Pass station north of Valdez recorded 974.5 inches of snow in a single season (1952-53). Yakutat averages around 170 inches of snow a year. Anchorage averages around 74 inches. Juneau averages around 86 inches despite being further south, because elevation and Pacific moisture combine. The Arctic averages only 25-30 inches a year. The Interior, surprisingly, only gets around 60-70 inches in Fairbanks despite the cold, because the air is too dry to produce big storms.
What is the wettest place in Alaska?
The Coastal Range of Southeast Alaska, with some specific watersheds receiving more than 275 inches of precipitation a year. The town of Ketchikan averages around 140 inches, though it has cleared 200 in wet years. Yakutat is in the same league.
Is Alaska always cold?
No. Interior Alaska regularly hits the upper 80s°F in summer, and has recorded 99°F at Fairbanks. The state record high is 100°F at Fort Yukon. Anchorage hit 90°F on July 4, 2019. The Arctic does stay cold most of the year, but even Utqiagvik averages around 47°F in July.
When is the best Alaska weather for tourists?
Mid-June through early August is the sweet spot. Long daylight, mild temperatures, most services open, salmon running, wildlife active. Southeast travelers should plan for rain regardless of month. The shoulders (late May and early September) are quieter, slightly cooler, with fewer bugs and lower prices, and we cover those tradeoffs in our Best Time to Visit Alaska guide.
Does Alaska weather change fast?
Yes. The single most important thing to internalize. Coastal regions in particular can shift from sunny to cold rain in under an hour. Aleutian conditions can shift in minutes. Plan every outdoor day around layers and shelter access, regardless of what the morning forecast looks like.
Where can I check actual Alaska weather forecasts?
The NWS Alaska Region page is the primary source for current forecasts. For long-term climate data and regional breakdowns, the research center at the University of Alaska Fairbanks publishes the most detailed records in the state.
Keep Exploring Alaska
Now that you have the weather sorted, the rest of your trip plans itself. Our Plan hub covers timing, costs, and itinerary basics. Hit the Explore hub for region and destination deep-dives. The Wildlife hub has the must-see animal shortlist and which operators are worth booking. The Adventure hub is for fishing, flying, hiking, and the stuff you actually came up here to do. And the Essential hub is where the gear lives.
Plan Your Trip
Start building your trip with the guides that actually matter. Everything from timing and packing to costs and itineraries, built from real experience.
Top picks:
Essential Guides
The gear, the boots, the bags. What you actually need.
Top picks:
- Rain Gear Alaska: What to Actually Pack
- Best Shoes for Alaska
- What to Pack for Alaska (Complete Packing List)
Explore Alaska
Where the weather actually lives. Region-specific deep dives.
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