Mount Desert Island Weather: September
 |
Average Day Temperature: | 68.1°F |
|
Average Night Temperature: | 56.3°F |
|
Sea Water Temperature: | 59.6°F |
|
Number of Sunny Days: | 13 days |
| Sunshine Hours: | 11.8 - 13.2 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 1.2 in | |
| detailed information | ||
forecast
| Mount Desert Island |
Temperature
| Mount Desert Island |
Air Temperature in September, °F
The highest day temperature in September 2025 was 77°F. The lowest night temperature was 41°F. The average values for day and night temperatures during September were 67.7°F и 54.1°F respectivly.
Mount Desert Island Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Mount Desert Island was 59.6°F. The maximum and minimum values were 57.4°F and 61.8°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Mount Desert Island is 1.2 in.
The average wind speed in September is 7.0 mph. It makes September one of the most windless months of the year for Mount Desert Island.
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 Mount Desert Island in September is 7.1 hours.
Mount Desert 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 |  |
0°F | SE 17 mph |
| 0600 | |
-2°F | SE 14 mph |
| 0900 |  |
4°F | SE 12 mph |
| 1200 | |
14°F | E 11 mph |
| 1500 | |
20°F | E 10 mph |
| 1800 | |
24°F | E 6 mph |
| 2100 |  |
22°F | E 7 mph |
| 0000 | |
20°F | E 5 mph |