Lowell Weather in September

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

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

September is in the fall / autumn in Lowell 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.

Lowell weather averages (imperial / metric)
Daytime temperature 22.5°C 72.5°F
Nightly temperature 10.5°C 50.9°F
Average temperature 16.5°C 61.7°F
Daily sunshine 8.1 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 9 days
Sea temperature 17.8°C 64.1°F
Humidity 74%
Windspeed 13.7kph 9 mph

On average September is the 5th driest month of the year in Lowell 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 8.1 hours of sunshine per day.

September temperatures in Lowell

Lowell average temperature in September

September rainfall

Lowell average rain in September

September hourly sunshine

Lowell 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 Lowell in September 2025.

Other monthly averages

Best places to visit in September

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Beta

Current (hourly) weather 15 day forecast

Lowell weather stats

Lowell weather statistics
Hottest month: July 27.6°C 81.7°F
Driest month: July 85mm 3.3ins
Sunniest month: July 10.2hrs
Coldest month: January 0.7°C 33.3°F
Wettest month: November 116mm 4.6ins
Map showing location of Lowell (42.63342, -71.31617) Lowell map pin © Google

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