New Brunswick Weather in September

What's the weather like in New Brunswick (New Jersey) in September 2025?

The climate in New Brunswick during September can be summarized as warm and damp.

September is in the fall / autumn in New Brunswick and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 25°C (77°F), whilst at night 13°C (55°F) is normal.

New Brunswick weather averages (imperial / metric)
Daytime temperature 24.8°C 76.6°F
Nightly temperature 13°C 55.4°F
Average temperature 18.9°C 66°F
Daily sunshine 7.8 hrs
Avg rainfall 105 mm 4.1 ins
Rainy days 8 days
Sea temperature 21°C 69.8°F
Humidity 71%
Windspeed 15.5kph 10 mph

On average September is the 4th wettest month of the year in New Brunswick with around 105mm 4.1 inches of rain making it a 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 7.8 hours of sunshine per day.

September temperatures in New Brunswick

New Brunswick average temperature in September

September rainfall

New Brunswick average rain in September

September hourly sunshine

New Brunswick 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 Brunswick 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 Brunswick weather stats

New Brunswick weather statistics
Hottest month: July 29.2°C 84.6°F
Driest month: February 76mm 3ins
Sunniest month: August 9hrs
Coldest month: January 2.7°C 36.9°F
Wettest month: July 123mm 4.8ins
Map showing location of New Brunswick (40.48622, -74.45182) New Brunswick map pin © Google

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