Weather in Mackinac Island: August
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Average day temperature: | 69.4°F |
| Average night temperature: | 64.0°F | |
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Sea water temperature: | 67.3°F |
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Number of sunny days: | 14 days |
| Day length: | 13.3 - 14.8 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 0.9 in. | |
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forecast
| Mackinac Island |
temperature
| Mackinac Island |
Air temperature in August, °F
The highest day temperature during August of 2025 was 79°F. At the same time the lowest night temperature was 53°F. Daily and nightly averages during August were 68.2°F and 65.0°F.
Sea water temperature in Mackinac Island in August, °F
The average sea water temperature in August of 2025 was 69.4°F. The highest and lowest sea temperatures during the month were 72.3°F and 65.3°F.
Mostly all days in August are sunny but cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in Mackinac Island in August is 0.9 in. Other months of the year show relatively similar values.
The average wind speed value in August is 8.7 mph It makes August one of the least windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 8.9.
Best time for vacation in Mackinac Island
Mackinac Island on a weather map
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