Willmar (MN)
September
Weather in Willmar, Minnesota for September 2026
Your guide to Willmar weather in September - trends and predictions
In general, the average temperature in Willmar at the beginning of September is 20.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.6 °F by the end of September.
Willmar experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 53 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
26°/14°
Temperatures
23 km/h
Avg max wind
62 %
Avg humidity
Willmar Weather September
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Temperatures trend during September in Willmar
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September weather in Willmar day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 21° /13° | 3.4 mm | 5 | |
| Sept. 2 |  Sunny | 23° /12° | 5.7 mm | 6 | |
| Sept. 3 | Sunny | 22° /12° | 0.6 mm | 6 | |
| Sept. 4 | Sunny | 22° /8° | 11.8 mm | 6 | |
| Sept. 5 |  Partly cloudy | 18° /12° | 0.1 mm | 5 | |
| Sept. 6 | Partly cloudy | 17° /7° | 0 mm | 5 | |
| Sept. 7 | Sunny | 20° /5° | 0 mm | 6 | |
| Sept. 8 | Sunny | 26° /9° | 0 mm | 7 | |
| Sept. 9 | Sunny | 25° /16° | 0 mm | 7 | |
| Sept. 10 |  Patchy rain possible | 27° /17° | 0.7 mm | 6 | |
| Sept. 11 | Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 12 | Sunny | 28° /16° | 15.7 mm | 7 | |
| Sept. 13 | Sunny | 28° /18° | 0 mm | 7 | |
| Sept. 14 | Overcast | 30° /18° | 0 mm | 7 | |
| Sept. 15 | Patchy rain possible | 31° /19° | 0.3 mm | 7 | |
| Sept. 16 | Patchy rain possible | 32° /18° | 0.1 mm | 7 | |
| Sept. 17 | Light rain shower | 26° /18° | 15.6 mm | 6 | |
| Sept. 18 | Partly cloudy | 27° /14° | 3.5 mm | 6 | |
| Sept. 19 |  Thundery outbreaks possible | 27° /16° | 9.7 mm | 6 | |
| Sept. 20 |  Fog | 27° /14° | 6 mm | 6 | |
| Sept. 21 | Mist | 26° /13° | 0 mm | 6 | |
| Sept. 22 | Fog | 23° /10° | 1.5 mm | 5 | |
| Sept. 23 |  Patchy light rain with thunder | 25° /10° | 20.8 mm | 6 | |
| Sept. 24 | Fog | 22° /11° | 0.4 mm | 5 | |
| Sept. 25 | Light rain shower | 26° /11° | 0.3 mm | 6 | |
| Sept. 26 | Fog | 24° /12° | 0.2 mm | 6 | |
| Sept. 27 | Sunny | 25° /12° | 0.1 mm | 6 | |
| Sept. 28 | Sunny | 27° /10° | 0 mm | 6 | |
| Sept. 29 | Light rain shower | 28° /12° | 4.2 mm | 6 | |
| Sept. 30 | Fog | 27° /15° | 0.7 mm | 6 | |
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Important Notice
Our weather forecast for Willmar 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 Willmar forecast closer to your planned date for the most up-to-date weather information.
Change Month
Willmar in September - FAQ
What are the expected maximum and minimum temperatures in Willmar during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Willmar during September?
Moderate rainfall is anticipated in Willmar during September, with a total of 53 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Willmar during September?
The average wind speed in Willmar during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Willmar
Explore the daily rainfall trends and prepare for Willmars September weather 💧
UV exposure in Willmar during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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