New London Weather in September

What's the weather like in New London (Connecticut) in September 2025?

The climate in New London during September can be summarized as mild and a little damp.

September is in the fall / autumn in New London and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 12°C (53°F) is normal.

New London weather averages (imperial / metric)
Daytime temperature 22.6°C 72.7°F
Nightly temperature 11.8°C 53.2°F
Average temperature 17.2°C 63°F
Daily sunshine 8.1 hrs
Avg rainfall 97 mm 3.8 ins
Rainy days 8 days
Sea temperature 19.6°C 67.3°F
Humidity 74%
Windspeed 14.8kph 9 mph

On average September is the 4th driest month of the year in New London with around 97mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.1 hours of sunshine per day.

September temperatures in New London

New London average temperature in September

September rainfall

New London average rain in September

September hourly sunshine

New London 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 New London 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

New London weather stats

New London weather statistics
Hottest month: July 26.7°C 80.1°F
Driest month: June 85mm 3.3ins
Sunniest month: March 8hrs
Coldest month: January 2°C 35.6°F
Wettest month: November 123mm 4.8ins
Map showing location of New London (41.35565, -72.09952) New London map pin © Google

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