Great River Weather in September

What's the weather like in Great River (New York) in September 2025?

The climate in Great River during September can be summarized as warm and a little damp.

September is in the fall / autumn in Great River and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 14°C (58°F) is normal.

Great River weather averages (imperial / metric)
Daytime temperature 23.7°C 74.6°F
Nightly temperature 14.4°C 57.8°F
Average temperature 19°C 66.2°F
Daily sunshine 8 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 8 days
Sea temperature 20.6°C 69.1°F
Humidity 76%
Windspeed 16.6kph 10 mph

On average September is the 5th driest month of the year in Great River with around 88mm 3.5 inches of rain making it a a little 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 8 hours of sunshine per day.

September temperatures in Great River

Great River average temperature in September

September rainfall

Great River average rain in September

September hourly sunshine

Great River 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 Great River 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

Great River weather stats

Great River weather statistics
Hottest month: July 27.5°C 81.5°F
Driest month: June 84mm 3.3ins
Sunniest month: October 7.5hrs
Coldest month: January 3.2°C 37.8°F
Wettest month: March 107mm 4.2ins
Map showing location of Great River (40.72121, -73.15761) Great River map pin © Google

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