The highest day temperature in September 2026 was 93°F. The lowest night temperature was 47°F. The average values for day and night temperatures during September were 74.4°F и 62.4°F respectivly.

The average sea surface temperature in September 2026 for South Haven was 65.7°F. The maximum and minimum values were 48.0°F and 75.2°F respectively.

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

Precipitation total in September for South Haven is 1.0 in.

The average wind speed in September is 9.4 mph. It makes September one of the most windless months of the year for South Haven.

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 South Haven in September is 7.8 hours.