Boothbay Harbor Weather in September

What's the weather like in Boothbay Harbor (Maine) in September 2025?

The climate in Boothbay Harbor during September can be summarized as mild and a little damp.

September is in the fall / autumn in Boothbay Harbor and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 21°C (70°F), whilst at night 10°C (50°F) is normal.

Boothbay Harbor weather averages (imperial / metric)
Daytime temperature 21.1°C 70°F
Nightly temperature 9.9°C 49.8°F
Average temperature 15.5°C 59.9°F
Daily sunshine 7.5 hrs
Avg rainfall 83 mm 3.3 ins
Rainy days 9 days
Sea temperature 14.8°C 58.7°F
Humidity 78%
Windspeed 13kph 8 mph

On average September is the 3rd driest month of the year in Boothbay Harbor with around 83mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.5 hours of sunshine per day.

September temperatures in Boothbay Harbor

Boothbay Harbor average temperature in September

September rainfall

Boothbay Harbor average rain in September

September hourly sunshine

Boothbay Harbor average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Boothbay Harbor in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Boothbay Harbor weather stats

Boothbay Harbor weather statistics
Hottest month: July 25.8°C 78.4°F
Driest month: July 77mm 3ins
Sunniest month: August 8.6hrs
Coldest month: January -0.9°C 30.4°F
Wettest month: November 125mm 4.9ins
Map showing location of Boothbay Harbor (43.8523, -69.6281) Boothbay Harbor map pin © Google

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