Green Bay (WI)
September
Weather in Green Bay, Wisconsin for September 2025
Your guide to Green Bay weather in September - trends and predictions
Until now, September 2025 in Green Bay is slightly cooler than the historical average by -1.3 °F.
The forecast for the upcoming days in Green Bay predicts a temperature of 24.1 °F, which is slightly above the historical average.
In general, the average temperature in Green Bay at the beginning of September is 20 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 22.7 °F by the end of September.
With an average of 2 rainy days, Green Bay experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
24°/12°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Green Bay Weather September
Move between months or click on a day
Temperatures trend during September in Green Bay
See the weather trend as well as the moving average line
September weather in Green Bay day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 23° /12° | 0 mm | 6 | |
| Sept. 2 |  Sunny | 22° /10° | 0 mm | 6 | |
| Sept. 3 | Sunny | 21° /10° | 12.2 mm | 6 | |
| Sept. 4 | Sunny | 19° /7° | 0 mm | 5 | |
| Sept. 5 |  Patchy rain possible | 21° /11° | 7.9 mm | 5 | |
| Sept. 6 | Patchy rain possible | 16° /7° | 0.1 mm | 4 | |
| Sept. 7 | Sunny | 18° /5° | 0 mm | 5 | |
| Sept. 8 | Partly cloudy | 21° /5° | 0 mm | 6 | |
| Sept. 9 | Sunny | 25° /12° | 0 mm | 6 | |
| Sept. 10 |  Cloudy | 25° /14° | 0 mm | 6 | |
| Sept. 11 | Patchy rain possible | 25° /15° | 0 mm | 6 | |
| Sept. 12 | Sunny | 25° /13° | 0 mm | 6 | |
| Sept. 13 | Cloudy | 25° /15° | 6.2 mm | 6 | |
| Sept. 14 |  Overcast | 28° /15° | 0 mm | 6 | |
| Sept. 15 | Patchy rain possible | 29° /17° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 31° /11° | 0 mm | 1.3 | |
| Sept. 17 | Patchy rain possible | 31° /15° | 0.5 mm | 1.3 | |
| Sept. 18 | Cloudy | 24° /18° | 0 mm | 1.3 | |
| Sept. 19 | Partly cloudy | 25° /15° | 0 mm | 1.3 | |
| Sept. 20 | Patchy rain possible | 19° /15° | 3.2 mm | 0 | |
| Sept. 21 | Patchy rain possible | 23° /16° | 1 mm | 4 | |
| Sept. 22 | Patchy rain possible | 27° /18° | 1.8 mm | 5 | |
| Sept. 23 | Patchy rain possible | 23° /13° | 2.9 mm | 4 | |
| Sept. 24 | Sunny | 27° /15° | 0 mm | 5 | |
| Sept. 25 | Sunny | 21° /10° | 0 mm | 4 | |
| Sept. 26 | Sunny | 17° /6° | 0 mm | 4 | |
| Sept. 27 | Sunny | 23° /8° | 0 mm | 4 | |
| Sept. 28 | Sunny | 25° /11° | 0 mm | 5 | |
| Sept. 29 | Partly cloudy | 22° /14° | 0 mm | 5 | |
| Sept. 30 |  Mist | 24° /10° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Green Bay 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 Green Bay forecast closer to your planned date for the most up-to-date weather information.
Change Month
Green Bay in September - FAQ
What are the expected maximum and minimum temperatures in Green Bay during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Green Bay during September?
Rainfall in Green Bay during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Green Bay during September?
The average wind speed in Green Bay during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Green Bay
Explore the daily rainfall trends and prepare for Green Bays September weather 💧
UV exposure in Green Bay during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Green Bay weather pages
You are here
Where is Green Bay?Get accurate weather forecasts for Green Bay, located at latitude 44.519 and longitude -88.02. Stay updated with localized weather information tailored for Green Bay.
Found a mistake?
We appreciate your attention to details. Tell us here.