Current sea water temperature:
+37.4°F
| Minimum sea water temperature in December: | 45.3°F |
| Maximum sea water temperature in December: | 36.1°F |
| Average sea water temperature in December: | 39.9°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| December 20 | 37.4°F | December 15 | 37.2°F |
| December 19 | 37.2°F | December 14 | 38.3°F |
| December 18 | 37.0°F | December 13 | 37.4°F |
| December 17 | 36.9°F | December 12 | 37.9°F |
| December 16 | 36.9°F | December 11 | 38.7°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
December
December
| 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: 19:30
December 20, saturday
2100
32°F
E
27 mph
27 mph
December 21, sunday
0000
25°F
E
29 mph
29 mph
0300
21°F
E
30 mph
30 mph
0600
19°F
E
28 mph
28 mph
0900
19°F
E
25 mph
25 mph
1200
19°F
SE
22 mph
22 mph
1500
21°F
SE
18 mph
18 mph
1800
21°F
SE
14 mph
14 mph
