Weather in Willmar, Minnesota for September 2026
Until now, September 2026 in Willmar has been nearly identical to the historical average, with a temperature of 25.3 °F (showing only a slight deviation of 0.1 °F).
Expect cooler weather in the next days in Willmar with the forecast suggesting a temperature of 16.2 °F, lower than the historical average.
In general, the average temperature in Willmar at the beginning of September is 23.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.7 °F by the end of September.
The climate of Willmar in September is notably wet, with an average of 11 rainy days, and a total of 101.3 mm of precipitation.
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Willmar Weather September
Temperatures trend during September in Willmar
September weather in Willmar day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 24° /12° | 2.3 mm | 4 | |
| Sept. 2 |  Sunny | 25° /13° | 4.3 mm | 4 | |
| Sept. 3 | Sunny | 25° /15° | 1.2 mm | 5 | |
| Sept. 4 | Sunny | 26° /12° | 7.9 mm | 6 | |
| Sept. 5 |  Partly cloudy | 22° /14° | 0.3 mm | 4 | |
| Sept. 6 | Partly cloudy | 21° /11° | 0 mm | 4 | |
| Sept. 7 | Sunny | 22° /9° | 0.4 mm | 5 | |
| Sept. 8 | Sunny | 27° /12° | 1.3 mm | 5 | |
| Sept. 9 | Sunny | 25° /15° | 0 mm | 6 | |
| Sept. 10 |  Patchy rain possible | 27° /14° | 0.4 mm | 6 | |
| Sept. 11 | Sunny | 28° /15° | 3 mm | 6 | |
| Sept. 12 | Sunny | 26° /15° | 10.5 mm | 6 | |
| Sept. 13 | Sunny | 26° /15° | 0 mm | 6 | |
| Sept. 14 | Overcast | 26° /16° | 12.1 mm | 5 | |
| Sept. 15 | Overcast | 28° /16° | 0.2 mm | 7 | |
| Sept. 16 | Patchy rain possible | 29° /15° | 4.1 mm | 6 | |
| Sept. 17 | Light rain shower | 25° /16° | 10.5 mm | 4 | |
| Sept. 18 | Partly cloudy | 25° /13° | 7.9 mm | 5 | |
| Sept. 19 | Overcast | 24° /15° | 7.6 mm | 5 | |
| Sept. 20 | Overcast | 16° /11° | 0 mm | 4.6 | |
| Sept. 21 | Overcast | 14° /10° | 1.2 mm | 4.1 | |
| Sept. 22 | Sunny | 18° /12° | 0 mm | 5.1 | |
| Sept. 23 | Sunny | 20° /11° | 0 mm | 5.1 | |
| Sept. 24 | Overcast | 17° /12° | 0.9 mm | 4 | |
| Sept. 25 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 26 | Sunny | 23° /14° | 0 mm | 6 | |
| Sept. 27 | Light rain shower | 22° /9° | 7 mm | 5 | |
| Sept. 28 | Patchy rain possible | 8° /5° | 9.2 mm | 3 | |
| Sept. 29 | Overcast | 12° /4° | 0 mm | 3 | |
| Sept. 30 | Overcast | 13° /5° | 0.5 mm | 4 | |
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Willmar in September - FAQ
What are the expected maximum and minimum temperatures in Willmar during September?
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September rainfall patterns in Willmar
UV exposure in Willmar during September
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Where is Willmar?Get accurate weather forecasts for Willmar, located at latitude 45.122 and longitude -95.043. Stay updated with localized weather information tailored for Willmar.