Missoula (MT)
September
Weather in Missoula, Montana for September 2025
Your guide to Missoula weather in September - trends and predictions
In general, the average temperature in Missoula at the beginning of September is 29.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.1 °F by the end of September.
Missoula experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 134.1 mm.
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Temperatures
Rain 🌧️
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23
Dry days
7
Rainy days
0
Snow days
23°/9°
Temperatures
12 km/h
Avg max wind
50 %
Avg humidity
Missoula Weather September
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Temperatures trend during September in Missoula
See the weather trend as well as the moving average line
September weather in Missoula day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 32° /9° | 0 mm | 7 | |
| Sept. 2 | Overcast | 33° /11° | 0 mm | 7 | |
| Sept. 3 |  Patchy rain possible | 23° /12° | 0.5 mm | 5 | |
| Sept. 4 |  Sunny | 27° /9° | 0 mm | 7 | |
| Sept. 5 | Sunny | 30° /9° | 0 mm | 8 | |
| Sept. 6 | Sunny | 32° /10° | 0 mm | 8 | |
| Sept. 7 | Sunny | 32° /10° | 0 mm | 8 | |
| Sept. 8 |  Partly cloudy | 32° /10° | 0 mm | 8 | |
| Sept. 9 | Sunny | 29° /11° | 0 mm | 7 | |
| Sept. 10 | Patchy rain possible | 28° /10° | 0.1 mm | 6 | |
| Sept. 11 |  Moderate or heavy rain shower | 21° /10° | 13 mm | 5 | |
| Sept. 12 | Moderate or heavy rain shower | 11° /9° | 33.7 mm | 3 | |
| Sept. 13 | Patchy rain possible | 17° /8° | 1.4 mm | 4 | |
| Sept. 14 | Overcast | 22° /5° | 0 mm | 5 | |
| Sept. 15 | Patchy rain possible | 19° /7° | 0.2 mm | 4 | |
| Sept. 16 |  Cloudy | 23° /7° | 3.6 mm | 5 | |
| Sept. 17 | Moderate or heavy rain shower | 18° /11° | 13.5 mm | 4 | |
| Sept. 18 | Moderate or heavy rain shower | 15° /10° | 62.6 mm | 4 | |
| Sept. 19 | Partly cloudy | 20° /7° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 18° /10° | 0 mm | 5 | |
| Sept. 21 | Cloudy | 17° /5° | 0 mm | 4 | |
| Sept. 22 | Overcast | 20° /6° | 0 mm | 5 | |
| Sept. 23 | Partly cloudy | 20° /10° | 0 mm | 6 | |
| Sept. 24 | Sunny | 25° /9° | 0 mm | 7 | |
| Sept. 25 | Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 26 | Patchy rain possible | 21° /12° | 5.1 mm | 5 | |
| Sept. 27 | Sunny | 24° /8° | 0 mm | 6 | |
| Sept. 28 | Sunny | 28° /8° | 0 mm | 7 | |
| Sept. 29 | Patchy rain possible | 18° /8° | 0.4 mm | 4 | |
| Sept. 30 | Cloudy | 11° /4° | 0 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Missoula 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 Missoula forecast closer to your planned date for the most up-to-date weather information.
Change Month
Missoula in September - FAQ
What are the expected maximum and minimum temperatures in Missoula during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Missoula during September?
Significant rainfall exceeding 134.1 mm is expected in Missoula during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Missoula during September?
The average wind speed in Missoula during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Missoula
Explore the daily rainfall trends and prepare for Missoulas September weather 💧
UV exposure in Missoula during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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