19.09
sat
sat
Day
57°F
W 14 mph
Precip.
5%
5%
Night
57°F
NW 5 mph
Precip.
21%
21%
20.09
sun
sun
Day
57°F
SW 9 mph
Precip.
14%
14%
Night
52°F
SW 19 mph
Precip.
20%
20%
21.09
mon
mon
Day
50°F
W 21 mph
Precip.
17%
17%
Night
54°F
W 20 mph
Precip.
14%
14%
22.09
tue
tue
Day
52°F
W 20 mph
Precip.
4%
4%
Night
57°F
W 19 mph
Precip.
4%
4%
23.09
wed
wed
Day
54°F
W 21 mph
Precip.
7%
7%
Night
54°F
W 8 mph
Precip.
8%
8%
24.09
thu
thu
Day
54°F
SW 6 mph
Precip.
11%
11%
Night
55°F
W 6 mph
Precip.
6%
6%
25.09
fri
fri
Day
55°F
E 4 mph
Precip.
6%
6%
Night
59°F
NE 4 mph
Precip.
4%
4%
sea water
temperature
temperature
| Mackinac Island |
monthly
weather
weather
| Mackinac Island |
current
weather
weather
| Mackinac Island |
14 days
forecast
forecast
| Mackinac Island |
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.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 58.1°F. The highest and lowest sea temperatures during the month were 62.8°F and 52.2°F.
Air temperature in Mackinac Island, °F
Precipitation total in Mackinac Island, in.
* Charts above show average data for the last 3 years.
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: 07:34
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
