Missoula County (Missoula)
September
Weather in Missoula County, Montana for September 2027
Your guide to Missoula County weather in September - trends and predictions
In general, the average temperature in Missoula County at the beginning of September is 26.8 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.7 °C by the end of September.
Missoula County experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 151.4 mm.
Is September a good time to visit Missoula County? check out the best time to travel to Missoula County page.
✨ Is September a good time to visit Missoula County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
23°/9°
Temperatures
11 km/h
Avg max wind
52 %
Avg humidity
Missoula County Weather September
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Temperatures trend during September in Missoula County
See the weather trend as well as the moving average line
September weather in Missoula County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 32° /13° | 0.2 mm | 6.8 | |
| Sept. 2 |  Light rain | 29° /12° | 5.3 mm | 5 | |
| Sept. 3 | Light rain | 25° /13° | 5.6 mm | 5 | |
| Sept. 4 |  Moderate rain | 25° /11° | 11.6 mm | 5 | |
| Sept. 5 | Light rain | 26° /10° | 4 mm | 5 | |
| Sept. 6 | Moderate rain | 27° /10° | 21.7 mm | 5 | |
| Sept. 7 |  Heavy rain | 24° /11° | 46.2 mm | 5 | |
| Sept. 8 |  Sunny | 25° /9° | 0 mm | 6.1 | |
| Sept. 9 | Sunny | 26° /10° | 0.6 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 27° /11° | 0 mm | 5.9 | |
| Sept. 11 |  Moderate or heavy rain shower | 22° /11° | 6.6 mm | 4 | |
| Sept. 12 | Moderate rain | 17° /10° | 12.2 mm | 3 | |
| Sept. 13 | Patchy rain possible | 19° /8° | 1.2 mm | 4 | |
| Sept. 14 | Light rain | 19° /7° | 3.2 mm | 4 | |
| Sept. 15 | Patchy rain possible | 17° /7° | 1.5 mm | 3 | |
| Sept. 16 | Patchy rain possible | 23° /8° | 1.2 mm | 5 | |
| Sept. 17 | Light rain | 22° /9° | 4.6 mm | 5 | |
| Sept. 18 | Moderate rain | 21° /10° | 20.9 mm | 4 | |
| Sept. 19 |  Partly cloudy | 22° /10° | 0.4 mm | 5 | |
| Sept. 20 | Sunny | 22° /9° | 0 mm | 5 | |
| Sept. 21 |  Cloudy | 21° /8° | 0 mm | 4.9 | |
| Sept. 22 | Overcast | 21° /7° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 23° /9° | 0 mm | 4.8 | |
| Sept. 24 | Sunny | 26° /9° | 0 mm | 4.7 | |
| Sept. 25 | Partly cloudy | 27° /10° | 0.1 mm | 4.6 | |
| Sept. 26 | Patchy rain possible | 18° /10° | 1.7 mm | 4 | |
| Sept. 27 | Sunny | 21° /5° | 0 mm | 4 | |
| Sept. 28 | Sunny | 24° /7° | 0 mm | 4.3 | |
| Sept. 29 | Overcast | 21° /8° | 0.1 mm | 4 | |
| Sept. 30 | Light rain | 15° /9° | 2.6 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Missoula County 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 County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Missoula County in September - FAQ
What are the expected maximum and minimum temperatures in Missoula County 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 County during September?
Significant rainfall exceeding 151.4 mm is expected in Missoula County 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 County during September?
The average wind speed in Missoula County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Missoula County
Explore the daily rainfall trends and prepare for Missoula Countys September weather 💧
Typically, Missoula County has 7 rainy days in September with a total of 151.4 mm of rainfall.
UV exposure in Missoula County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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