Measurements:
°C
°F
CURRENT WEATHER
14:59
Mackinac Island
54°F
SE 5 mph
Feels like: 52°F
Precip: 0%
World Resorts USA Mackinac Island Weather

7 Day Weather Forecast

05.14
thu
DAY
50°F
S 6 mph
precip
0%
NIGHT
44°F
NE 5 mph
precip
0%
05.15
fri
DAY
52°F
N 11 mph
precip
0%
NIGHT
54°F
NE 13 mph
precip
0%
05.16
sat
DAY
54°F
NE 11 mph
precip
0%
NIGHT
46°F
S 6 mph
precip
0%
05.17
sun
DAY
48°F
W 14 mph
precip
0%
NIGHT
48°F
W 17 mph
precip
100%
05.18
mon
DAY
68°F
N 14 mph
precip
0%
NIGHT
60°F
N 8 mph
precip
100%
05.19
tue
DAY
62°F
NE 21 mph
precip
100%
NIGHT
48°F
E 19 mph
precip
0%
05.20
wed
DAY
46°F
E 24 mph
precip
0%
NIGHT
42°F
SE 10 mph
precip
0%

Mackinac Island Sea Water Temperature in May, °F

Select Year: 2025 2024 2023

The average sea surface temperature in May 2025 for Mackinac Island was 6.5°F. The maximum and minimum values were 3.2°F and 10.0°F respectively.

Mackinac Island on the Weather Map

Best Time to Visit Mackinac Island
The most sunny months:
July 14 days
August 14 days
September 12 days
The most warm months:
August 71.6 °F
July 71.5 °F
September 64.4 °F
Warmest sea temperature:
August 69.2 °F
July 66.8 °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
May 2 days
April 2 days
The most windy months:
November 13 mph
December 13 mph
April 11 mph
more details