Bristol Weather in September

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

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

September is in the fall / autumn in Bristol and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 11°C (51°F) is normal.

Bristol weather averages (imperial / metric)
Daytime temperature 22.9°C 73.2°F
Nightly temperature 10.5°C 50.9°F
Average temperature 16.7°C 62.1°F
Daily sunshine 7.9 hrs
Avg rainfall 97 mm 3.8 ins
Rainy days 9 days
Sea temperature 19.6°C 67.3°F
Humidity 74%
Windspeed 14kph 9 mph

On average September is the 6th wettest month of the year in Bristol with around 97mm 3.8 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 7.9 hours of sunshine per day.

September temperatures in Bristol

Bristol average temperature in September

September rainfall

Bristol average rain in September

September hourly sunshine

Bristol 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 Bristol 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

Bristol weather stats

Bristol weather statistics
Hottest month: July 27.8°C 82°F
Driest month: February 80mm 3.1ins
Sunniest month: July 9.8hrs
Coldest month: January 0.4°C 32.7°F
Wettest month: November 104mm 4.1ins
Map showing location of Bristol (41.67176, -72.94927) Bristol map pin © Google

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