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Green Bay weather in September 2025
Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Green Bay in September. Check more long-term weather averages for Green Bay in September before you book your next holiday to Wisconsin in 2025/2026.
- 2121°C max day temperature
- 7 hours of sunshine per day
- 1010 days with some rainfall
- 1010°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 8888 mm of monthly rainfall
- 55 (Moderate) UV index
- 1818°C sea temperature
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Recommended for Wisconsin
The September weather guide for Wisconsin (Green Bay) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Green Bay in September?
Daytime temperatures usually reach 21°C in Green Bay in September, falling to 10°C at night.
How sunny is it in Green Bay in September?
There are normally 7 hours of bright sunshine each day in Green Bay in September - that's 54% of daylight hours.
How warm is the sea around Green Bay in September?
The average sea temperature around Green Bay in September is 18°C.
Does it rain in Green Bay in September?
There are usually 10 days with some rain in Green Bay in September and the average monthly rainfall is 88mm.
Green Bay September sunrise & sunset times
Browse the sunrise and sunset times for Green Bay in September 2025. Select a month to view Green Bay sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:15 | 18:28 |
Monday, 15th September 2025 | 05:31 | 18:02 |
Tuesday, 30th September 2025 | 05:49 | 17:34 |
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