The temperatures in Bar Harbor in September are usually low and can range between 12°C and 20°C.
You can expect about 3 to 8 days of rain in Bar Harbor during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Bar Harbor in September 2025.
If you’re planning to visit Bar Harbor in the near future, we highly recommend that you review the 14 day weather forecast for Bar Harbor before you arrive.
Temperatures
20° / 12°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
97
mm
Sun Hours
10.0
Hrs
