Harbor Isle Weather in September

What's the weather like in Harbor Isle (New York) in September 2025?

The climate in Harbor Isle during September can be summarized as warm and a little damp.

September is in the fall / autumn in Harbor Isle and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 15°C (59°F) is normal.

Harbor Isle weather averages (imperial / metric)
Daytime temperature 23.9°C 75°F
Nightly temperature 15.1°C 59.2°F
Average temperature 19.5°C 67.1°F
Daily sunshine 7.9 hrs
Avg rainfall 86 mm 3.4 ins
Rainy days 8 days
Sea temperature 20.6°C 69.1°F
Humidity 72%
Windspeed 17.3kph 11 mph

On average September is the 3rd driest month of the year in Harbor Isle with around 86mm 3.4 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 7.9 hours of sunshine per day.

September temperatures in Harbor Isle

Harbor Isle average temperature in September

September rainfall

Harbor Isle average rain in September

September hourly sunshine

Harbor Isle 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 Harbor Isle 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

Harbor Isle weather stats

Harbor Isle weather statistics
Hottest month: July 28°C 82.4°F
Driest month: October 80mm 3.1ins
Sunniest month: August 9.2hrs
Coldest month: January 3.2°C 37.8°F
Wettest month: April 101mm 4ins
Map showing location of Harbor Isle (40.60344, -73.66457) Harbor Isle map pin © Google

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