Measurements:
°C
°F
CURRENT WEATHER
10:32
Mount Desert Island
56°F
S 6 mph
Feels like: 56°F
Precip: 4%
World Resorts USA Mount Desert Island Weather

7 Day Weather Forecast

09.15
tue
DAY
66°F
S 2 mph
precip
1%
NIGHT
50°F
NE 2 mph
precip
13%
09.16
wed
DAY
68°F
NE 11 mph
precip
7%
NIGHT
58°F
E 4 mph
precip
30%
09.17
thu
DAY
68°F
W 4 mph
precip
14%
NIGHT
58°F
NE 2 mph
precip
43%
09.18
fri
DAY
70°F
SE 19 mph
precip
2%
NIGHT
48°F
S 11 mph
precip
3%
09.19
sat
DAY
60°F
SE 5 mph
precip
1%
NIGHT
46°F
NE 3 mph
precip
12%
09.20
sun
DAY
52°F
N 7 mph
precip
80%
NIGHT
48°F
S 4 mph
precip
34%
09.21
mon
DAY
58°F
NW 9 mph
precip
12%
NIGHT
46°F
SW 5 mph
precip
11%

Mount Desert Island Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Mount Desert Island was 14.6°F. The maximum and minimum values were 13.7°F and 16.0°F respectively.

Mount Desert Island on the Weather Map

Best Time to Visit Mount Desert Island
The most sunny months:
October 13 days
September 13 days
November 13 days
The most warm months:
July 75.5 °F
August 74.9 °F
June 69.2 °F
Warmest sea temperature:
August 62.8 °F
July 60.7 °F
September 59.6 °F
The most cold months:
January 26.6 °F
February 27.9 °F
December 33.1 °F
The most rainy months:
December 3 days
October 3 days
March 2 days
The most windy months:
December 11 mph
March 10 mph
February 10 mph
more details