The highest day temperature in September 2025 was 80°F. The lowest night temperature was 46°F. The average values for day and night temperatures during September were 69.7°F и 57.8°F respectivly.

The average sea surface temperature in September 2025 for Sturgeon Bay was 65.7°F. The maximum and minimum values were 59.0°F and 71.0°F respectively.

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

Precipitation total in September for Sturgeon Bay is 0.7 in.

The average wind speed in September is 9.1 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 Sturgeon Bay in September is 7.7 hours.