Current sea water temperature:
+70.5°F
| Minimum sea water temperature in August: | 73.2°F |
| Maximum sea water temperature in August: | 59.9°F |
| Average sea water temperature in August: | 67.4°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| August 14 | 70.5°F | August 9 | 70.0°F |
| August 13 | 70.5°F | August 8 | 69.4°F |
| August 12 | 70.2°F | August 7 | 69.3°F |
| August 11 | 69.4°F | August 6 | 68.4°F |
| August 10 | 69.8°F | August 5 | 68.9°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 66.8°F. The highest and lowest sea temperatures during the month were 70.9°F and 62.2°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
August
August
| 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: 03:50
August 14, friday
0600
63°F
S
6 mph
6 mph
0900
64°F
S
4 mph
4 mph
1200
70°F
SW
5 mph
5 mph
1500
73°F
W
3 mph
3 mph
1800
73°F
SW
3 mph
3 mph
2100
70°F
SW
7 mph
7 mph
August 15, saturday
0000
64°F
S
8 mph
8 mph
0300
63°F
W
4 mph
4 mph
