Green Bay Weather in September

What's the weather like in Green Bay, United States in September 2020?

The climate in Green Bay during September can be summarized as mild and a little damp.

September is in the fall / autumn in Green Bay and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 21°C (69°F), whilst at night 9°C (48°F) is normal.

Green Bay weather averages (imperial / metric)
Daytime temperature 20.8°C 69.4°F
Nightly temperature 9°C 48.2°F
Average temperature 14.9°C 58.8°F
Daily sunshine 7.4 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 11 days
Sea temperature 17.7°C 63.8°F
Humidity 77%
Windspeed 14.8kph 9 mph

On average September is the 2nd wettest month of the year in Green Bay with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.4 hours of sunshine per day.

September temperatures in Green Bay

September rainfall

September hourly sunshine

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in September 2020.

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Green Bay weather stats

Green Bay weather statistics
Hottest month: July 26.8°C 80.2°F
Driest month: February 27mm 1.1ins
Sunniest month: July 11hrs
Coldest month: January -5°C 23°F
Wettest month: August 88mm 3.5ins
Map showing location of Green Bay (44.51916, -88.01983)

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