Wisconsin (Milwaukee)
September
Weather in Wisconsin for September 2026
Your guide to Wisconsin weather in September - trends and predictions
Until now, September 2026 in Wisconsin is slightly cooler than the historical average by 0.9 °F.
An exceptional deviation from the historical average is forecasted for next days of September 2026 in Wisconsin with the forecasted temperature being 14.6 °F, much lower than usual.
In general, the average temperature in Wisconsin at the beginning of September is 26.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °F by the end of September.
The climate of Wisconsin in September is notably wet, with an average of 12 rainy days, and a total of 69.6 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
18
Dry days
12
Rainy days
0
Snow days
24°/14°
Temperatures
16 km/h
Avg max wind
72 %
Avg humidity
Wisconsin Weather September
Move between months or click on a day
What’s the Weather Like in Wisconsin This September?
Discover the average temperatures and weather trends across Wisconsin’s cities this September.
Temperatures trend during September in Wisconsin
See the weather trend as well as the moving average line
September weather in Wisconsin day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /14° | 0 mm | 6 | |
| Sept. 2 | Sunny | 28° /15° | 0.1 mm | 6 | |
| Sept. 3 |  Cloudy | 28° /16° | 35.4 mm | 5 | |
| Sept. 4 |  Overcast | 29° /15° | 5.8 mm | 5 | |
| Sept. 5 | Overcast | 27° /16° | 1 mm | 5 | |
| Sept. 6 |  Light rain shower | 24° /12° | 1.2 mm | 6 | |
| Sept. 7 | Overcast | 21° /9° | 0.4 mm | 5 | |
| Sept. 8 | Cloudy | 23° /9° | 0 mm | 4 | |
| Sept. 9 |  Mist | 25° /14° | 6.8 mm | 5 | |
| Sept. 10 | Mist | 26° /13° | 0 mm | 6 | |
| Sept. 11 | Sunny | 25° /14° | 1 mm | 6 | |
| Sept. 12 | Overcast | 24° /14° | 0.1 mm | 5 | |
| Sept. 13 | Light rain shower | 21° /14° | 6.4 mm | 5 | |
| Sept. 14 | Mist | 24° /13° | 0.1 mm | 6 | |
| Sept. 15 | Mist | 27° /15° | 5.4 mm | 6 | |
| Sept. 16 |  Patchy light drizzle | 26° /15° | 0.9 mm | 5 | |
| Sept. 17 | Mist | 24° /14° | 1 mm | 5 | |
| Sept. 18 | Cloudy | 22° /14° | 1.2 mm | 5 | |
| Sept. 19 |  Thundery outbreaks possible | 22° /15° | 14 mm | 4 | |
| Sept. 20 | Thundery outbreaks possible | 24° /16° | 8.3 mm | 5 | |
| Sept. 21 | Patchy rain possible | 23° /15° | 0.7 mm | 5 | |
| Sept. 22 |  Moderate or heavy rain shower | 22° /14° | 16.8 mm | 5 | |
| Sept. 23 | Fog | 21° /13° | 1.8 mm | 5 | |
| Sept. 24 | Overcast | 20° /14° | 0 mm | 5 | |
| Sept. 25 | Patchy rain possible | 20° /13° | 0.2 mm | 4 | |
| Sept. 26 | Fog | 22° /12° | 7.6 mm | 5 | |
| Sept. 27 | Fog | 22° /13° | 1.8 mm | 4 | |
| Sept. 28 | Patchy rain possible | 21° /14° | 0 mm | 5 | |
| Sept. 29 | Overcast | 22° /13° | 0 mm | 5.1 | |
| Sept. 30 | Overcast | 19° /16° | 7.4 mm | 0.6 | |
| Next | |||||
Important Notice
Our weather forecast for Wisconsin 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 Wisconsin forecast closer to your planned date for the most up-to-date weather information.
Change Month
Wisconsin in September - FAQ
What are the expected maximum and minimum temperatures in Wisconsin during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Wisconsin during September?
Moderate rainfall is anticipated in Wisconsin during September, with a total of 69.6 mm spread over approximately 12 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Wisconsin during September?
The average wind speed in Wisconsin during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Wisconsin
Explore the daily rainfall trends and prepare for Wisconsins September weather 💧
Typically, Wisconsin has 12 rainy days in September with a total of 69.6 mm of rainfall.
UV exposure in Wisconsin during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in Wisconsin
Select a county for an accurate weather forecast
Top locations in Wisconsin
Select a location for an accurate weather forecast
More Locations Quick links
More Wisconsin weather pages
You are here
Where is Wisconsin?Get accurate weather forecasts for Wisconsin, located at latitude 43.039 and longitude -87.906. Stay updated with localized weather information tailored for Wisconsin.
Found a mistake?
We appreciate your attention to details. Tell us here.