Juneau City and Borough (Juneau)
September
Weather in Juneau City and Borough, Alaska for September 2026
Your guide to Juneau City and Borough weather in September - trends and predictions
So far, September 2026 in Juneau City and Borough is slightly warmer than the historical average by 1.6 °F.
Expect cooler weather in the next days in Juneau City and Borough with the forecast suggesting a temperature of 9 °F, lower than the historical average.
In general, the average temperature in Juneau City and Borough at the beginning of September is 12.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8.6 °F by the end of September.
Juneau City and Borough experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 400.7 mm.
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Temperatures
Rain 🌧️
More
1
Dry days
29
Rainy days
0
Snow days
9°/4°
Temperatures
9 km/h
Avg max wind
90 %
Avg humidity
Juneau City and Borough Weather September
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Temperatures trend during September in Juneau City and Borough
See the weather trend as well as the moving average line
September weather in Juneau City and Borough 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 | Patchy rain possible | 13° /6° | 8.8 mm | 3 | |
| Sept. 11 | Light drizzle | 11° /5° | 9.6 mm | 3 | |
| Sept. 12 |  Fog | 11° /6° | 11.3 mm | 2 | |
| Sept. 13 |  Moderate rain | 11° /5° | 10.4 mm | 2 | |
| Sept. 14 | Moderate rain | 11° /5° | 21.8 mm | 2 | |
| Sept. 15 | Patchy rain possible | 13° /8° | 0.2 mm | 0.5 | |
| Sept. 16 | Light rain shower | 10° /7° | 5.5 mm | 0.3 | |
| Sept. 17 | Patchy rain possible | 11° /7° | 1.5 mm | 3 | |
| Sept. 18 |  Moderate or heavy rain shower | 8° /5° | 61.6 mm | 2 | |
| Sept. 19 | Light rain shower | 9° /6° | 15 mm | 2 | |
| Sept. 20 | Light rain shower | 6° /3° | 50.1 mm | 2 | |
| Sept. 21 | Light rain shower | 5° /3° | 21.3 mm | 1 | |
| Sept. 22 | Light rain shower | 7° /5° | 7.6 mm | 2 | |
| Sept. 23 | Sunny | 9° /3° | 0 mm | 3 | |
| Sept. 24 |  Overcast | 9° /5° | 0 mm | 2 | |
| Sept. 25 | Light rain shower | 8° /2° | 11.8 mm | 1 | |
| Sept. 26 | Sunny | 9° /5° | 0 mm | 3 | |
| Sept. 27 | Overcast | 13° /8° | 0 mm | 3 | |
| 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 City and Borough 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 City and Borough forecast closer to your planned date for the most up-to-date weather information.
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Juneau City and Borough in September - FAQ
What are the expected maximum and minimum temperatures in Juneau City and Borough 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 City and Borough during September?
Significant rainfall exceeding 400.7 mm is expected in Juneau City and Borough during September, occurring over more than 29 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Juneau City and Borough in September 2026?
Juneau City and Borough typically sees 0 cm of snowfall during September.
What are the typical wind conditions in Juneau City and Borough during September?
The average wind speed in Juneau City and Borough during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Juneau City and Borough
Explore the daily rainfall trends and prepare for Juneau City and Boroughs September weather 💧
Typically, Juneau City and Borough has 29 rainy days in September with a total of 400.7 mm of rainfall.
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Where is Juneau City and Borough?Get accurate weather forecasts for Juneau City and Borough, located at latitude 58.302 and longitude -134.42. Stay updated with localized weather information tailored for Juneau City and Borough.
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