Weather in Missoula, Montana for September 2026
Until now, September 2026 in Missoula is cooler than usual, with temperatures averaging 21.4 °F, this is 2.4 °F below the typical seasonal average.
The forecast for the coming days of September 2026 predicts a temperature of 22.8 °F , which is warmer than usual.
In general, the average temperature in Missoula at the beginning of September is 27.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F 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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Missoula Weather September
Temperatures trend during September in Missoula
September weather in Missoula day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 32° /12° | 0.2 mm | 7 | |
| Sept. 2 | Overcast | 30° /12° | 5.3 mm | 5 | |
| Sept. 3 |  Patchy rain possible | 25° /12° | 5.6 mm | 5 | |
| Sept. 4 |  Sunny | 25° /11° | 11.6 mm | 5 | |
| Sept. 5 | Sunny | 26° /10° | 4 mm | 5 | |
| Sept. 6 | Sunny | 27° /9° | 21.7 mm | 5 | |
| Sept. 7 | Sunny | 25° /11° | 46.2 mm | 5 | |
| Sept. 8 | Sunny | 26° /9° | 0 mm | 7 | |
| Sept. 9 | Sunny | 26° /10° | 0.6 mm | 6 | |
| Sept. 10 | Patchy rain possible | 27° /11° | 0 mm | 6 | |
| Sept. 11 |  Moderate or heavy rain shower | 22° /10° | 6.6 mm | 4 | |
| Sept. 12 | Overcast | 18° /9° | 12.2 mm | 3 | |
| Sept. 13 | Patchy rain possible | 19° /8° | 1.2 mm | 4 | |
| Sept. 14 | Overcast | 20° /7° | 3.2 mm | 4 | |
| Sept. 15 | Overcast | 17° /7° | 1.5 mm | 3 | |
| Sept. 16 | Sunny | 23° /7° | 1.2 mm | 5 | |
| Sept. 17 | Moderate or heavy rain shower | 23° /9° | 4.6 mm | 5 | |
| Sept. 18 | Moderate or heavy rain shower | 21° /10° | 20.9 mm | 4 | |
| Sept. 19 |  Partly cloudy | 22° /9° | 0.4 mm | 5 | |
| Sept. 20 | Sunny | 23° /9° | 0 mm | 6 | |
| Sept. 21 |  Cloudy | 21° /8° | 0 mm | 5 | |
| Sept. 22 | Overcast | 21° /7° | 0 mm | 4 | |
| Sept. 23 | Partly cloudy | 24° /8° | 0 mm | 5 | |
| Sept. 24 | Sunny | 26° /8° | 0 mm | 6 | |
| Sept. 25 | Partly cloudy | 27° /10° | 0.1 mm | 5 | |
| Sept. 26 | Patchy rain possible | 20° /12° | 2.5 mm | 5 | |
| Sept. 27 | Overcast | 16° /2° | 0 mm | 3.4 | |
| Sept. 28 | Sunny | 20° /5° | 0 mm | 4.2 | |
| Sept. 29 | Sunny | 20° /4° | 0 mm | 4.4 | |
| Sept. 30 | Overcast | 21° /7° | 0 mm | 4.5 | |
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Missoula in September - FAQ
What are the expected maximum and minimum temperatures in Missoula during September?
How much rainfall should be expected in Missoula during September?
What are the typical wind conditions in Missoula during September?
September rainfall patterns in Missoula
UV exposure in Missoula during September
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