Current sea water temperature:
+36.0°F
| Minimum sea water temperature in April: | 41.4°F |
| Maximum sea water temperature in April: | 32.2°F |
| Average sea water temperature in April: | 35.5°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| April 29 | 36.0°F | April 24 | 35.1°F |
| April 28 | 35.4°F | April 23 | 32.9°F |
| April 27 | 35.6°F | April 22 | 34.9°F |
| April 26 | 40.3°F | April 21 | 34.9°F |
| April 25 | 35.8°F | April 20 | 34.9°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:
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
May
May
| 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: 08:36
April 29, wednesday
0900
37°F
SE
10 mph
10 mph
1200
41°F
SE
9 mph
9 mph
1500
43°F
E
12 mph
12 mph
1800
45°F
SE
13 mph
13 mph
2100
39°F
SE
12 mph
12 mph
April 30, thursday
0000
34°F
SE
11 mph
11 mph
0300
34°F
SE
11 mph
11 mph
0600
34°F
SE
11 mph
11 mph
