Current sea water temperature:
+45.3°F
| Minimum sea water temperature in May: | 52.5°F |
| Maximum sea water temperature in May: | 36.1°F |
| Average sea water temperature in May: | 42.5°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| May 30 | 45.3°F | May 25 | 43.5°F |
| May 29 | 45.7°F | May 24 | 42.8°F |
| May 28 | 46.8°F | May 23 | 41.7°F |
| May 27 | 45.0°F | May 22 | 41.7°F |
| May 26 | 43.3°F | May 21 | 41.9°F |
Monthly sea water temperature, °F
When is the warmest sea in Mackinac Island?
Based on the data about daily sea water temperature for the last three years the warmest sea in Mackinac Island was noticed in August, July and September.
Monthly Sea Temperatures in Mackinac Island, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
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.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 65.8°F. The highest and lowest sea temperatures during the month were 70.7°F and 59.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 61.9°F. The highest and lowest sea temperatures during the month were 67.1°F and 59.4°F.
current
weather
weather
| Mackinac Island |
weather in
June
June
| Mackinac Island |
Best time for vacation in Mackinac Island
Mackinac Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Mackinac Island
Local time: 01:24
May 31, sunday
0300
50°F
N
4 mph
4 mph
0600
50°F
E
3 mph
3 mph
0900
54°F
E
4 mph
4 mph
1200
57°F
E
8 mph
8 mph
1500
59°F
E
11 mph
11 mph
1800
59°F
E
9 mph
9 mph
2100
54°F
E
9 mph
9 mph
June 01, monday
0000
50°F
SE
6 mph
6 mph
