Current sea water temperature:
+41.4°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: | 40.0°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| December 4 | 41.4°F | November 29 | 43.5°F |
| December 3 | 41.4°F | November 28 | 43.2°F |
| December 2 | 41.4°F | November 27 | 43.7°F |
| December 1 | 42.4°F | November 26 | 44.1°F |
| November 30 | 42.8°F | November 25 | 44.4°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
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: 23:11
December 05, friday
0000
19°F
N
22 mph
22 mph
0300
21°F
N
22 mph
22 mph
0600
25°F
NE
24 mph
24 mph
0900
28°F
NE
22 mph
22 mph
1200
28°F
NE
19 mph
19 mph
1500
30°F
NE
16 mph
16 mph
1800
32°F
NE
16 mph
16 mph
2100
32°F
NE
16 mph
16 mph
