Current sea water temperature:
+67.5°F
| Minimum sea water temperature in July: | 71.8°F |
| Maximum sea water temperature in July: | 57.0°F |
| Average sea water temperature in July: | 65.3°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| July 21 | 67.5°F | July 16 | 70.2°F |
| July 20 | 67.8°F | July 15 | 70.3°F |
| July 19 | 68.0°F | July 14 | 70.2°F |
| July 18 | 70.0°F | July 13 | 69.6°F |
| July 17 | 69.6°F | July 12 | 69.4°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 67.4°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
July
July
| 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: 11:53
July 21, tuesday
1200
64°F
SE
20 mph
20 mph
1500
64°F
SE
22 mph
22 mph
1800
61°F
SE
25 mph
25 mph
2100
54°F
SE
22 mph
22 mph
July 22, wednesday
0000
54°F
SE
22 mph
22 mph
0300
54°F
SE
20 mph
20 mph
0600
55°F
SE
20 mph
20 mph
0900
57°F
SE
17 mph
17 mph
