The highest day temperature in July 2026 was 79°F. The lowest night temperature was 56°F. The average values for day and night temperatures during July were 72.1°F и 64.8°F respectivly.

The average sea surface temperature in July 2026 for Mackinac Island was 68.7°F. The maximum and minimum values were 63.6°F and 73.2°F respectively.

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

Precipitation total in July for Mackinac Island is 1.0 in. It makes july one of the most rainy months of the year.

The average wind speed in July is 8.1 mph. It makes July the most windless month of the year for Mackinac Island.

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 July is 10.2 hours.