Measurements:
°C
°F
CURRENT WEATHER
16:28
Mackinac Island
70°F
W 5 mph
Feels like: 70°F
Precip: 7%
World Resorts USA Mackinac Island Weather

7 Day Weather Forecast

08.05
wed
DAY
68°F
W 8 mph
precip
10%
NIGHT
64°F
SE 2 mph
precip
6%
08.06
thu
DAY
72°F
N 1 mph
precip
6%
NIGHT
70°F
N 4 mph
precip
15%
08.07
fri
DAY
76°F
N 2 mph
precip
6%
NIGHT
72°F
N 6 mph
precip
12%
08.08
sat
DAY
74°F
E 7 mph
precip
5%
NIGHT
70°F
W 6 mph
precip
9%
08.09
sun
DAY
72°F
SE 8 mph
precip
24%
NIGHT
64°F
SE 7 mph
precip
4%
08.10
mon
DAY
70°F
E 7 mph
precip
3%
NIGHT
62°F
S 9 mph
precip
6%
08.11
tue
DAY
70°F
E 10 mph
precip
4%
NIGHT
64°F
SE 6 mph
precip
24%

Mackinac Island Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Mackinac Island was 20.8°F. The maximum and minimum values were 18.5°F and 22.4°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 69.2 °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
more details