New Britain Weather in September

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

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

September is in the fall / autumn in New Britain and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (74°F), whilst at night 12°C (53°F) is normal.

New Britain weather averages (imperial / metric)
Daytime temperature 23.3°C 73.9°F
Nightly temperature 11.6°C 52.8°F
Average temperature 17.4°C 63.3°F
Daily sunshine 8 hrs
Avg rainfall 93 mm 3.7 ins
Rainy days 9 days
Sea temperature 19.6°C 67.3°F
Humidity 74%
Windspeed 14.4kph 9 mph

On average September is the 6th wettest month of the year in New Britain with around 93mm 3.7 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 8 hours of sunshine per day.

September temperatures in New Britain

New Britain average temperature in September

September rainfall

New Britain average rain in September

September hourly sunshine

New Britain 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 Britain in September 2025.

Other monthly averages

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UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

New Britain weather stats

New Britain weather statistics
Hottest month: July 27.7°C 81.9°F
Driest month: February 81mm 3.2ins
Sunniest month: July 9.8hrs
Coldest month: January 1°C 33.8°F
Wettest month: November 102mm 4ins
Map showing location of New Britain (41.66121, -72.77954) New Britain map pin © Google

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