Missoula (MT)
September
Weather in Missoula, Montana for September 2026
Your guide to Missoula weather in September - trends and predictions
In general, the average temperature in Missoula at the beginning of September is 29.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.1 °C by the end of September.
Missoula experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 79.7 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
24°/10°
Temperatures
11 km/h
Avg max wind
48 %
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° /13° | 0 mm | 8 | |
| Sept. 2 | Overcast | 33° /14° | 0 mm | 8 | |
| Sept. 3 |  Patchy rain possible | 28° /14° | 0.2 mm | 7 | |
| Sept. 4 |  Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 5 | Sunny | 27° /10° | 0 mm | 7 | |
| Sept. 6 | Sunny | 30° /10° | 0 mm | 8 | |
| Sept. 7 | Sunny | 30° /13° | 0 mm | 7 | |
| Sept. 8 |  Partly cloudy | 29° /10° | 0 mm | 8 | |
| Sept. 9 | Sunny | 28° /12° | 0.9 mm | 7 | |
| Sept. 10 | Patchy rain possible | 27° /11° | 0.1 mm | 6 | |
| Sept. 11 |  Moderate or heavy rain shower | 22° /11° | 6.5 mm | 5 | |
| Sept. 12 | Moderate or heavy rain shower | 15° /10° | 18.3 mm | 4 | |
| Sept. 13 | Patchy rain possible | 20° /9° | 0.7 mm | 5 | |
| Sept. 14 | Overcast | 23° /8° | 4.7 mm | 5 | |
| Sept. 15 | Patchy rain possible | 17° /10° | 2.3 mm | 4 | |
| Sept. 16 |  Cloudy | 24° /10° | 1.8 mm | 6 | |
| Sept. 17 | Moderate or heavy rain shower | 22° /11° | 6.8 mm | 6 | |
| Sept. 18 | Moderate or heavy rain shower | 21° /10° | 31.3 mm | 6 | |
| Sept. 19 | Partly cloudy | 23° /9° | 0 mm | 6 | |
| Sept. 20 | Partly cloudy | 23° /10° | 0 mm | 6 | |
| Sept. 21 | Cloudy | 19° /8° | 0 mm | 5 | |
| Sept. 22 | Overcast | 20° /6° | 0 mm | 5 | |
| Sept. 23 | Partly cloudy | 23° /8° | 0 mm | 7 | |
| Sept. 24 | Sunny | 26° /9° | 0 mm | 7 | |
| Sept. 25 | Partly cloudy | 28° /12° | 0 mm | 7 | |
| Sept. 26 | Patchy rain possible | 20° /12° | 2.5 mm | 5 | |
| Sept. 27 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 28 | Sunny | 27° /8° | 0 mm | 7 | |
| Sept. 29 | Patchy rain possible | 22° /9° | 0.2 mm | 5 | |
| Sept. 30 | Cloudy | 15° /8° | 3.5 mm | 4 | |
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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 24° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Missoula during September?
Moderate rainfall is anticipated in Missoula during September, with a total of 79.7 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Missoula during September?
The average wind speed in Missoula during September is 11 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 💧
Typically, Missoula has 9 rainy days in September with a total of 79.7 mm of rainfall.
UV exposure in Missoula during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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