Current sea water temperature:
+36.0°F
| Minimum sea water temperature in December: | 45.3°F |
| Maximum sea water temperature in December: | 35.4°F |
| Average sea water temperature in December: | 39.7°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| December 30 | 36.0°F | December 25 | 35.8°F |
| December 29 | 35.8°F | December 24 | 36.3°F |
| December 28 | 35.8°F | December 23 | 36.0°F |
| December 27 | 35.4°F | December 22 | 37.6°F |
| December 26 | 35.8°F | December 21 | 37.4°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: 18:25
December 30, tuesday
2100
21°F
E
13 mph
13 mph
December 31, wednesday
0000
19°F
E
14 mph
14 mph
0300
19°F
SE
14 mph
14 mph
0600
18°F
S
9 mph
9 mph
0900
18°F
SE
10 mph
10 mph
1200
16°F
SE
19 mph
19 mph
1500
16°F
SE
20 mph
20 mph
1800
14°F
SE
23 mph
23 mph
