The highest day temperature in September 2023 was 82°F. The lowest night temperature was 50°F. The average values for day and night temperatures during September were 65.9°F и 60.6°F respectivly.

The average sea surface temperature in September 2023 for Mackinac Island was 63.2°F. The maximum and minimum values were 60.4°F and 67.4°F respectively.

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

Precipitation total in September for Mackinac Island is 0.9 in.

The average wind speed in September is 9.7 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 Mackinac Island in September is 7.7 hours.