Alaska (Juneau)
September
Weather in Alaska for September 2025
Your guide to Alaska weather in September - trends and predictions
High Wind Watch - See hour by hour.
So far, September 2025 in Alaska shows a warmer trend than usual by 2.3 °F.
Expect cooler weather in the next days in Alaska with the forecast suggesting a temperature of 8 °F, lower than the historical average.
In general, the average temperature in Alaska at the beginning of September is 11.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8.3 °F by the end of September.
Alaska experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 399.7 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
2
Dry days
28
Rainy days
0
Snow days
8°/4°
Temperatures
9 km/h
Avg max wind
91 %
Avg humidity
Alaska Weather September
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What’s the Weather Like in Alaska This September?
Discover the average temperatures and weather trends across Alaska’s cities this September.
Temperatures trend during September in Alaska
See the weather trend as well as the moving average line
September weather in Alaska day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 13° /6° | 6.6 mm | 3 | |
| 2 Sept. | Light rain shower | 12° /5° | 3.8 mm | 3 | |
| 3 Sept. | Light rain shower | 13° /6° | 3.2 mm | 3 | |
| 4 Sept. | Light rain shower | 11° /6° | 9.4 mm | 3 | |
| 5 Sept. | Light rain shower | 13° /6° | 7.9 mm | 3 | |
| 6 Sept. |  Light rain | 10° /6° | 8.5 mm | 2 | |
| 7 Sept. | Light rain shower | 11° /5° | 14.7 mm | 3 | |
| 8 Sept. | Patchy rain possible | 11° /4° | 13.3 mm | 3 | |
| 9 Sept. | Light drizzle | 11° /5° | 1.9 mm | 3 | |
| 10 Sept. |  Sunny | 13° /6° | 11.6 mm | 4 | |
| 11 Sept. | Light drizzle | 10° /5° | 12.8 mm | 3 | |
| 12 Sept. |  Fog | 9° /5° | 15 mm | 2 | |
| 13 Sept. |  Moderate rain | 10° /4° | 13.9 mm | 2 | |
| 14 Sept. | Moderate rain | 10° /4° | 29.1 mm | 3 | |
| 15 Sept. | Moderate rain | 7° /4° | 20.2 mm | 2 | |
| 16 Sept. | Moderate rain | 10° /6° | 17.2 mm | 0.3 | |
| 17 Sept. |  Heavy rain | 8° /6° | 20.4 mm | 0.1 | |
| 18 Sept. | Heavy rain | 7° /5° | 25.3 mm | 0.2 | |
| 19 Sept. | Heavy rain | 8° /6° | 59.9 mm | 0.1 | |
| 20 Sept. | Moderate rain | 8° /6° | 15.4 mm | 0 | |
| 21 Sept. | Moderate rain | 8° /6° | 8 mm | 2 | |
| 22 Sept. | Moderate rain | 7° /4° | 7.8 mm | 1 | |
| 23 Sept. | Patchy rain possible | 5° /3° | 4.2 mm | 1 | |
| 24 Sept. | Fog | 8° /3° | 0 mm | 1 | |
| 25 Sept. | Sunny | 9° /1° | 0 mm | 2 | |
| 26 Sept. | Sunny | 9° /3° | 0 mm | 3 | |
| 27 Sept. |  Partly cloudy | 9° /2° | 0 mm | 2 | |
| 28 Sept. | Sunny | 8° /0° | 0 mm | 2 | |
| 29 Sept. | Patchy rain possible | 8° /1° | 0.1 mm | 1 | |
| 30 Sept. | Patchy light drizzle | 7° /1° | 4.2 mm | 2 | |
| Next | |||||
Important Notice
Our weather forecast for Alaska in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Alaska forecast closer to your planned date for the most up-to-date weather information.
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Alaska in September - FAQ
What are the expected maximum and minimum temperatures in Alaska during September?
Prepare for cooler days with highs just around 8° and colder nights, dipping below 4°.
How much rainfall should be expected in Alaska during September?
Significant rainfall exceeding 399.7 mm is expected in Alaska during September, occurring over more than 28 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Alaska in September 2025?
Alaska typically sees 0 cm of snowfall during September.
What are the typical wind conditions in Alaska during September?
The average wind speed in Alaska during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Alaska
Explore the daily rainfall trends and prepare for Alaskas September weather 💧
Counties in Alaska
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Top locations in Alaska
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AnchorageDenali National ParkFairbanksGlacier Bay National Park and PreserveJuneauKetchikanSewardSitkaSkagwayWhittier
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