Average temperatures for September at cities, communities, lakes and other locations throughout Maine are listed below in degrees Fahrenheit and Celsius.

Maine Weather in September, USA ; High Temperature. 20°C · 68°F ; Low Temperature. 8°C · 46°F ; Rainfall. 34 mm ; Chance of Rain. 43 % ; Chance of Snow Day. 0 %.

Get the monthly weather forecast for Maine, ME, including daily high/low, historical averages, to help you plan ahead.

Maine Weather in September, USA ; Temperature. 15°C ; High Temperature. 20°C ; Low Temperature. 10°C ; Rainfall Days. 14 days ; Rainfall. 110 mm ...

Get the monthly weather forecast for York Harbor, ME, including daily high/low, historical averages, to help you plan ahead.

September weather in Portland Maine, United States. Daily high temperatures decrease by 10°F, from 73°F to 63°F, rarely falling below 55°F or exceeding 82°F.

The highs can soar up to 70°F (21.1°C), making it pleasantly warm on certain days, while the lows dip down to around 54.7°F (12.6°C). This range allows ...

The climate good here september. The high seasonal norm is 70°F. In the morning the temperature drops to 56°F. Thus, the mean temperature average in september ...

The weather in Bar Harbor in September is mildly cool and breezy, with average highs of 66°F (19°C) and lows of 55°F (13°C).

Maine weather in September 2025. Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Maine in September.