Dedham Weather in September

What's the weather like in Dedham (Massachusetts) in September 2025?

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

September is in the fall / autumn in Dedham 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.

Dedham weather averages (imperial / metric)
Daytime temperature 22.8°C 73°F
Nightly temperature 11.9°C 53.3°F
Average temperature 17.3°C 63.1°F
Daily sunshine 8.2 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 9 days
Sea temperature 17.8°C 64.1°F
Humidity 73%
Windspeed 14.8kph 9 mph

On average September is the 4th driest month of the year in Dedham with around 88mm 3.5 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 8.2 hours of sunshine per day.

September temperatures in Dedham

Dedham average temperature in September

September rainfall

Dedham average rain in September

September hourly sunshine

Dedham 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 Dedham 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

Dedham weather stats

Dedham weather statistics
Hottest month: July 27.7°C 81.9°F
Driest month: July 77mm 3ins
Sunniest month: July 9.9hrs
Coldest month: January 1.2°C 34.2°F
Wettest month: November 114mm 4.5ins
Map showing location of Dedham (42.24177, -71.16616) Dedham map pin © Google

Locations nearby

Top United States locations