Measurements:
°C
°F
CURRENT WEATHER
17:28
Mackinac Island
72°F
SE 5 mph
Feels like: 72°F
Precip: 14%
World Resorts USA Mackinac Island Weather

7 Day Weather Forecast

08.25
tue
DAY
68°F
SE 4 mph
precip
17%
NIGHT
62°F
N 11 mph
precip
9%
08.26
wed
DAY
70°F
NE 16 mph
precip
56%
NIGHT
64°F
SE 11 mph
precip
42%
08.27
thu
DAY
68°F
E 16 mph
precip
9%
NIGHT
60°F
SE 17 mph
precip
22%
08.28
fri
DAY
60°F
SE 6 mph
precip
4%
NIGHT
58°F
SW 4 mph
precip
3%
08.29
sat
DAY
70°F
NW 2 mph
precip
15%
NIGHT
74°F
NE 13 mph
precip
19%
08.30
sun
DAY
72°F
N 19 mph
precip
45%
NIGHT
66°F
SW 7 mph
precip
4%
08.31
mon
DAY
66°F
W 19 mph
precip
22%
NIGHT
62°F
NW 21 mph
precip
76%

Mackinac Island Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Mackinac Island was 20.7°F. The maximum and minimum values were 19.0°F and 21.9°F respectively.

Mackinac Island on the Weather Map

Best Time to Visit Mackinac Island
The most sunny months:
July 16 days
August 14 days
June 12 days
The most warm months:
August 71.6 °F
July 71.6 °F
September 64.4 °F
Warmest sea temperature:
August 69.6 °F
July 67.0 °F
September 64.1 °F
The most cold months:
February 20.1 °F
January 20.4 °F
December 28.6 °F
The most rainy months:
August 3 days
April 2 days
July 2 days
The most windy months:
November 13 mph
December 13 mph
April 11 mph
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