Mackinac Island Weather: September
 |
Average Day Temperature: | 64.4°F |
|
Average Night Temperature: | 59.1°F |
|
Sea Water Temperature: | 64.1°F |
|
Number of Sunny Days: | 12 days |
| Sunshine Hours: | 11.7 - 13.3 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.6 in | |
| detailed information | ||
forecast
| Mackinac Island |
Temperature
| Mackinac Island |
Air Temperature in September, °F
The highest day temperature in September 2025 was 68°F. The lowest night temperature was 50°F. The average values for day and night temperatures during September were 62.3°F и 59.2°F respectivly.
Mackinac Island Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Mackinac Island was 63.3°F. The maximum and minimum values were 60.4°F and 69.0°F respectively.
You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Mackinac Island is 0.6 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 9.5 mph.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Mackinac Island in September is 7.1 hours.
Mackinac Island on the Weather Map
| Chicago |  |
0 |
| Hawaii |  |
+78 |
| Honolulu | |
+78 |
| Houston | |
+46 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach | |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0300 |  |
18°F | N 22 mph |
| 0600 |  |
22°F | NE 24 mph |
| 0900 | |
26°F | NE 22 mph |
| 1200 | |
26°F | NE 19 mph |
| 1500 | |
28°F | NE 16 mph |
| 1800 | |
30°F | NE 16 mph |
| 2100 |  |
30°F | NE 16 mph |
| 0000 | |
30°F | E 17 mph |