Current sea water temperature:
+33.6°F
| Minimum sea water temperature in January: | 38.5°F |
| Maximum sea water temperature in January: | 32.9°F |
| Average sea water temperature in January: | 35.5°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| January 14 | 33.6°F | January 9 | 34.3°F |
| January 13 | 33.6°F | January 8 | 34.5°F |
| January 12 | 34.0°F | January 7 | 34.5°F |
| January 11 | 34.5°F | January 6 | 34.7°F |
| January 10 | 34.3°F | January 5 | 35.2°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
January
January
| 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: 16:11
January 14, wednesday
1800
12°F
S
21 mph
21 mph
2100
10°F
S
20 mph
20 mph
January 15, thursday
0000
9°F
S
17 mph
17 mph
0300
9°F
S
14 mph
14 mph
0600
9°F
S
11 mph
11 mph
0900
9°F
S
9 mph
9 mph
1200
12°F
S
5 mph
5 mph
1500
16°F
E
5 mph
5 mph
