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 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.6 °C 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.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
25°/13°
Temperatures
22 km/h
Avg max wind
71 %
Avg humidity
Willmar Weather September
Move between months or click on a day
Temperatures trend during September in Willmar
See the weather trend as well as the moving average line
September weather in Willmar day by day
Click on a date for more information
| 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 | |
| Next | |||||
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 25° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Willmar during September?
Significant rainfall exceeding 101.3 mm is expected in Willmar during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Willmar during September?
The average wind speed in Willmar during September is 22 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 💧
Typically, Willmar has 11 rainy days in September with a total of 101.3 mm of rainfall.
UV exposure in Willmar during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Willmar weather pages
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.