Brown County (Green Bay)
September
Weather in Brown County, Wisconsin for September 2025
Your guide to Brown County weather in September - trends and predictions
Until now, September 2025 in Brown County is slightly cooler than the historical average by -1.3 °F.
The forecast for the upcoming days in Brown County predicts a temperature of 24.1 °F, which is slightly above the historical average.
In general, the average temperature in Brown County 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, Brown County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
24°/12°
Temperatures
18 km/h
Avg max wind
71 %
Avg humidity
Brown County Weather September
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Temperatures trend during September in Brown County
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September weather in Brown County day by day
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| 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 | |
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Important Notice
Our weather forecast for Brown County 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 Brown County forecast closer to your planned date for the most up-to-date weather information.
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Brown County in September - FAQ
What are the expected maximum and minimum temperatures in Brown County 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 Brown County during September?
Rainfall in Brown County 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 Brown County during September?
The average wind speed in Brown County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Brown County
Explore the daily rainfall trends and prepare for Brown Countys September weather 💧
UV exposure in Brown County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Brown County?Get accurate weather forecasts for Brown County, located at latitude 44.519 and longitude -88.02. Stay updated with localized weather information tailored for Brown County.
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