Alaska weather by month
Introduction
Alaska is the largest state in the United States, and its weather reflects that scale. From the tundra of the north to the temperate rainforest of the southeast, temperatures, precipitation, and daylight vary dramatically throughout the year. If you’re planning a trip or simply curious about how life changes across the seasons, understanding Alaska weather by month is essential. This guide offers a month‑by‑month breakdown, travel tips, and answers to the most common questions travelers ask.
Monthly Weather Overview
Below is a quick reference table summarizing average high and low temperatures, precipitation levels, and notable weather patterns for each month. These figures come from the National Oceanic and Atmospheric Administration (NOAA) and represent statewide averages—your local experience may differ depending on region and elevation.
| Month | Avg. High (°F) | Avg. Low (°F) | Avg. Precipitation | Notes |
|---|---|---|---|---|
| January | 5 | –10 | 2.2 in | Coldest month; daylight minimal |
| February | 7 | –9 | 2.0 in | Still freezing; occasional snowstorms |
| March | 10 | –7 | 2.4 in | Spring begins; sunrise lengthens |
| April | 15 | –3 | 3.1 in | Rainy season peaks; wildfires start |
| May | 22 | 3 | 3.4 in | Warmest nights; daylight hours top 16 hrs |
| June | 28 | 7 | 2.5 in | Longest day; low precipitation |
| July | 33 | 10 | 2.0 in | Warmest month; best for outdoor activities |
| August | 30 | 8 | 2.7 in | Mild; early signs of cool‑down |
| September | 24 | 4 | 3.0 in | Shortening daylight; cooler temperatures |
| October | 16 | –2 | 3.2 in | First snow begins; autumn colors |
| November | 7 | –8 | 2.9 in | Falling temperatures; preparation for winter |
| December | 0 | –12 | 2.3 in | Winter begins; daylight very short |
January Weather in Alaska
- Temperature: Average highs hover around 5 °F while lows dip below –10 °F.
- Precipitation: Snow dominates, sometimes falling as hard-packed blizzards.
- Daylight: Less than 7 hours, with the sun only briefly above the horizon.
- What to Expect: Heavy Arctic winds, ice‑cover on rivers, and the peak of the Northern Lights viewing window.
February Weather in Alaska
- Temperature: Slightly warmer than January with highs of 7 °F.
- Precipitation: Mix of snow and early melt; a few days see rapid freeze‑thaw cycles.
- Daylight: Gradually increasing, but still very short.
- What to Expect: Continued aurora activity, and in south‑west Alaska a chance to spot migrating whales.
March Weather in Alaska
- Temperature: Transition month; highs reach 10 °F, lows around –7 °F.
- Precipitation: Snowfall lessens; rain becomes more frequent.
- Daylight: Lengthens quickly, over 10 hours by month’s end.
- What to Expect: Wildlife spotting gains during spring migration; the Arctic Circle becomes more accessible.
April Weather in Alaska
- Temperature: Warm up to 15 °F during the day, though nights can still dip to –3 °F.
- Precipitation: Heaviest monthly rainfall/ snowfall—up to 3.1 inches.
- Daylight: Hours climb to 14–15; nature awakens.
- What to Expect: Flurries in interior, lush greens across Southeast Alaska; wildfire risk starts.
May Weather in Alaska
- Temperature: Summer begins; highs reach 22 °F, lows climb above freezing.
- Precipitation: Continues to be moderate with 3.4 inches.
- Daylight: Near 16 hours; the famous “midnight sun” is at its zenith.
- What to Expect: Glacier viewing, hiking, and the final of the salmon‑run season.
June Weather in Alaska
- Temperature: Warmest nights; highs 28 °F, lows 7 °F.
- Precipitation: Very dry, only 2.5 inches.
- Daylight: 19–20 hours, often staying bright past midnight.
- What to Expect: Perfect for kayaking, bear‑watching, and exploring the vast wilderness with minimal cloud cover.
July Weather in Alaska
- Temperature: Peak temperatures; highs around 33 °F, lows about 10 °F.
- Precipitation: Lowest monthly rainfall at 2.0 inches.
- Daylight: 20+ hours; the world is bathed in golden light.
- What to Expect: Outdoor festivals, fishing tournaments, and the quietest nights for stargazing.
August Weather in Alaska
- Temperature: Slightly cooler than July but still mild—highs 30 °F, lows 8 °F.
- Precipitation: 2.7 inches; occasional rain showers.
- Daylight: 18–19 hours; dusk falls early.
- What to Expect: End of salmon season, fall colors, and prime time for wildlife migration spotting.
September Weather in Alaska
- Temperature: Cooler trend begins; highs 24 °F, lows 4 °F.
- Precipitation: 3.0 inches; mixed precipitation types.
- Daylight: Shortening fast, around 13 hours.
- What to Expect: Bird migrations peak, vibrant foliage, and more reliable forecast patterns for tourists.
October Weather in Alaska
- Temperature: Cold starts; highs 16 °F, lows below freezing at –2 °F.
- Precipitation: 3.2 inches; heavy rainfall in the southeast.
- Daylight: Roughly 8–10 hours; twilight deepens.
- What to Expect: Snow beginning in interior regions, first frost in coastal communities, and the aurora becomes increasingly active.
November Weather in Alaska
- Temperature: Average highs of 7 °F, lows approaching –8 °F.
- Precipitation: 2.9 inches, mostly snow in most areas.
- Daylight: Only 5–6 hours; the sun is low.
- What to Expect: Roads may start to close; planning for severe winter weather is essential.
December Weather in Alaska
- Temperature: Coldest month; highs around 0 °F, lows dropping to –12 °F.
- Precipitation: 2.3 inches of snow.
- Daylight: Around 5 hours; long nights dominate.
- What to Expect: Peak winter conditions; winter sports, aurora hunting, and a chance to experience the deep Arctic night.
Travel Tips for Each Season
| Season | Best Activities | Packing Essentials | Safety Reminders |
|---|---|---|---|
| Winter (Dec–Feb) | Skiing, dog sledding, aurora viewing | Thermal layers, insulated boots, GPS, emergency kit | Check road closures; watch for avalanches |
| Spring (Mar–Apr) | Wildlife watching, early salmon runs, glacier hikes | Waterproof jacket, layered clothing, headlamp | Check tides, respect wildlife |
| Summer (May–Aug) | Kayaking, hiking, whale watching | Sunscreen, bug spray, light but warm layers | Water safety, avoid hiking alone |
| Fall (Sep–Nov) | Bird migrations, cabin stays, berry picking | Warm clothing, portable battery pack, sturdy boots | Be aware of changing daylight, bring firewood |
FAQ
-
What is the best time of year to see the Northern Lights in Alaska?
The peak viewing months are September through March when nights are longest and skies are clearest.
-
Is it safe to travel by car in Alaska’s winter?
Yes—provided you’re prepared with proper tires, emergency supplies, and a pre‑planned route. Always check for road conditions.
-
How much daylight does Alaska get in winter?
In Fairbanks, daylight can be as short as 5 hours in December; in August, it can last over 20 hours.
-
Do I need a special permit to camp in Alaska?
Managed backcountry campsites require permits, but many areas allow free dispersed camping. Check local regulations.
- What wildlife can I expect to see year‑round?
Bears, moose, caribou, migratory birds, and, in coastal regions, whales and sea otters.
Resources
- Alaska State Tourism Office – https://www.alaskatourism.org
- National Weather Service (Alaska Region) – https://www.weather.gov/ak
- Alaska Department of Natural Resources – Wildfire Information – https://dnr.alaska.gov/fire/
- Alaska Outdoor Association – Trail Guides – https://www.alaskaoutdoor.org/trails
- U.S. Forest Service – Alaska National Forests – https://www.fs.usda.gov/alaska
With a clear picture of how each month shapes temperatures, precipitation, and daylight, you can plan a trip that maximizes your experience—whether you’re hunting the aurora, trekking a glacier, or simply enjoying the majestic Alaskan landscape. Happy travels!
