Current sea water temperature:
+63.0°F
| Minimum sea water temperature in September: | 68.9°F |
| Maximum sea water temperature in September: | 55.9°F |
| Average sea water temperature in September: | 62.9°F |
| more information | |
14 days
forecast
forecast
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
Sea water temperature for the last 10 days:
| September 19 | 63.0°F | September 14 | 64.8°F |
| September 18 | 62.8°F | September 13 | 65.3°F |
| September 17 | 62.8°F | September 12 | 66.2°F |
| September 16 | 61.5°F | September 11 | 65.8°F |
| September 15 | 63.9°F | September 10 | 65.8°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 68.3°F. The highest and lowest sea temperatures during the month were 71.4°F and 63.9°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 64.7°F. The highest and lowest sea temperatures during the month were 67.3°F and 61.5°F.
current
weather
weather
| Mackinac Island |
weather in
September
September
| 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: 07:04
September 19, saturday
0900
54°F
NW
11 mph
11 mph
1200
57°F
W
14 mph
14 mph
1500
57°F
W
16 mph
16 mph
1800
57°F
W
17 mph
17 mph
2100
57°F
NW
12 mph
12 mph
September 20, sunday
0000
57°F
NW
5 mph
5 mph
0300
55°F
W
6 mph
6 mph
0600
55°F
SW
10 mph
10 mph
