Juneau (AK)
September
Weather in Juneau, Alaska for September 2026
Your guide to Juneau weather in September - trends and predictions
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So far, September 2026 in Juneau is slightly warmer than the historical average by 0.9 °F.
The forecast for the next days in Juneau predicts temperatures to be around 12 °F, close to the historical average.
In general, the average temperature in Juneau at the beginning of September is 12.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 7 °F by the end of September.
Juneau experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 400.7 mm.
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Temperatures
Rain 🌧️
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1
Dry days
29
Rainy days
0
Snow days
9°/4°
Temperatures
9 km/h
Avg max wind
90 %
Avg humidity
Juneau Weather September
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Temperatures trend during September in Juneau
See the weather trend as well as the moving average line
September weather in Juneau day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 13° /6° | 8.2 mm | 3 | |
| Sept. 2 | Light rain shower | 13° /6° | 2.9 mm | 3 | |
| Sept. 3 | Light rain shower | 14° /6° | 2.4 mm | 3 | |
| Sept. 4 |  Sunny | 13° /7° | 7.1 mm | 3 | |
| Sept. 5 | Light rain shower | 13° /6° | 6 mm | 3 | |
| Sept. 6 |  Light rain | 11° /7° | 6.5 mm | 2 | |
| Sept. 7 | Light rain shower | 12° /6° | 11.1 mm | 2 | |
| Sept. 8 | Patchy rain possible | 10° /5° | 18.8 mm | 2 | |
| Sept. 9 | Light drizzle | 11° /6° | 6.8 mm | 2 | |
| Sept. 10 | Sunny | 13° /7° | 0 mm | 2.9 | |
| Sept. 11 | Sunny | 13° /7° | 0 mm | 3.5 | |
| Sept. 12 | Sunny | 14° /9° | 0 mm | 3.1 | |
| Sept. 13 | Sunny | 13° /8° | 0 mm | 3.4 | |
| Sept. 14 | Sunny | 13° /8° | 0 mm | 4 | |
| Sept. 15 |  Overcast | 13° /8° | 0 mm | 4 | |
| Sept. 16 | Overcast | 11° /8° | 0 mm | 3 | |
| Sept. 17 | Overcast | 12° /8° | 0.1 mm | 3 | |
| Sept. 18 |  Fog | 14° /9° | 0 mm | 4 | |
| Sept. 19 | Sunny | 11° /8° | 13.3 mm | 4 | |
| Sept. 20 | Light rain shower | 9° /8° | 25.9 mm | 2 | |
| Sept. 21 | Light rain shower | 8° /7° | 47.8 mm | 2 | |
| Sept. 22 | Light rain shower | 9° /6° | 19.6 mm | 2 | |
| Sept. 23 | Patchy rain possible | 9° /7° | 0.2 mm | 2 | |
| Sept. 24 | Overcast | 7° /3° | 13.1 mm | 2 | |
| Sept. 25 | Overcast | 7° /3° | 9.8 mm | 2 | |
| Sept. 26 | Light rain | 7° /3° | 13.5 mm | 2 | |
| Sept. 27 | Light drizzle | 7° /2° | 11.3 mm | 2 | |
| Sept. 28 | Patchy rain possible | 6° /2° | 3.5 mm | 2 | |
| Sept. 29 | Patchy rain possible | 7° /2° | 0.8 mm | 2 | |
| Sept. 30 | Patchy light drizzle | 8° /1° | 2.8 mm | 2 | |
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Important Notice
Our weather forecast for Juneau 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 Juneau forecast closer to your planned date for the most up-to-date weather information.
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Juneau in September - FAQ
What are the expected maximum and minimum temperatures in Juneau during September?
Prepare for cooler days with highs just around 9° and colder nights, dipping below 4°.
How much rainfall should be expected in Juneau during September?
Significant rainfall exceeding 400.7 mm is expected in Juneau during September, occurring over more than 29 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Juneau in September 2026?
Juneau typically sees 0 cm of snowfall during September.
What are the typical wind conditions in Juneau during September?
The average wind speed in Juneau during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Juneau
Explore the daily rainfall trends and prepare for Juneaus September weather 💧
Typically, Juneau has 29 rainy days in September with a total of 400.7 mm of rainfall.
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