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United States weather

Weather in Green Bay, Wisconsin for September 2026

Your guide to Green Bay weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Green Bay has been nearly identical to the historical average, with a temperature of 23 °F (showing only a slight deviation of 0.4 °F).

  • The forecast for the next days in Green Bay predicts a temperature of 17.7 °F, which is cooler than the historical average.

  • In general, the average temperature in Green Bay at the beginning of September is 22.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 19.9 °F by the end of September.

    • Rain 🌧️

  • Green Bay experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 45.9 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/12°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Green Bay Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
27°
2
Sunny
24°
3
Sunny
23°
4
Sunny
22°
5
Patchy rain possible
22°
6
Patchy rain possible
19°
7
Overcast
20°
8
Partly cloudy
23°
9
Overcast
27°
10
Cloudy
25°
11
Patchy rain possible
26°
12
Sunny
26°
13
Cloudy
23°
14
Overcast
26°
15
Patchy rain possible
27°
16
Sunny
26°
17
Partly cloudy
25°
18
Fog
23°
19
Mist
20°
20
Light rain shower
20°
21
Sunny
22°
22
Mist
19°
23
Sunny
20°
24
Sunny
19°
25
Overcast
21°
26
Sunny
21°
27
Overcast
20°
28
Sunny
21°
29
Sunny
22°
30
Moderate rain
15°

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
August October
Date Weather Temperatures Rain UV More
Sept. 1 Partly cloudy
Partly cloudy
 27° /15° 0 mm 6
Sept. 2 Sunny
Sunny
 24° /13° 158.2 mm 4
Sept. 3 Sunny
Sunny
 23° /13° 13.7 mm 5
Sept. 4 Sunny
Sunny
 22° /11° 18.2 mm 3
Sept. 5 Patchy rain possible
Patchy rain possible
 22° /13° 5.5 mm 3
Sept. 6 Patchy rain possible
Patchy rain possible
 19° /9° 0.1 mm 5
Sept. 7 Overcast
Overcast
 20° /7° 0 mm 4
Sept. 8 Partly cloudy
Partly cloudy
 23° /8° 11.4 mm 4
Sept. 9 Overcast
Overcast
 27° /14° 0 mm 6
Sept. 10 Cloudy
Cloudy
 25° /13° 0 mm 6
Sept. 11 Patchy rain possible
Patchy rain possible
 26° /14° 0 mm 6
Sept. 12 Sunny
Sunny
 26° /14° 0.2 mm 5
Sept. 13 Cloudy
Cloudy
 23° /14° 4.1 mm 5
Sept. 14 Overcast
Overcast
 26° /12° 1.7 mm 6
Sept. 15 Patchy rain possible
Patchy rain possible
 27° /15° 5.1 mm 4
Sept. 16 Sunny
Sunny
 26° /12° 0 mm 5
Sept. 17 Partly cloudy
Partly cloudy
 25° /13° 0.2 mm 5
Sept. 18 Fog
Fog
 23° /13° 5.4 mm 4
Sept. 19 Mist
Mist
 20° /11° 0.9 mm 4
Sept. 20 Light rain shower
Light rain shower
 20° /13° 7 mm 4
Sept. 21 Sunny
Sunny
 22° /12° 0 mm 4
Sept. 22 Mist
Mist
 19° /13° 1.3 mm 4
Sept. 23 Sunny
Sunny
 20° /10° 0 mm 5
Sept. 24 Sunny
Sunny
 19° /11° 0 mm 4.8
Sept. 25 Overcast
Overcast
 21° /13° 0.1 mm 2.8
Sept. 26 Sunny
Sunny
 21° /10° 0 mm 4.8
Sept. 27 Overcast
Overcast
 20° /10° 0 mm 4.7
Sept. 28 Sunny
Sunny
 21° /11° 0 mm 6
Sept. 29 Sunny
Sunny
 22° /13° 2.1 mm 6
Sept. 30 Moderate rain
Moderate rain
 15° /10° 39.3 mm 3
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.
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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 23° 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?
In September, Green Bay can expect light to moderate rainfall, totaling 45.9 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.

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 💧
Typically, Green Bay has 6 rainy days in September with a total of 45.9 mm of rainfall.

UV exposure in Green Bay during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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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.

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