The highest day temperature in September 2023 was 109°F. The lowest night temperature was 46°F. The average values for day and night temperatures during September were 78.4°F и 60.8°F respectivly.

The average sea surface temperature in September 2023 for Green Bay was 69.7°F. The maximum and minimum values were 66.4°F and 76.2°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Green Bay is 1.0 in.

The average wind speed in September is 9.2 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Green Bay in September is 7.8 hours.