Hamilton Weather in September

What's the weather like in Hamilton (Ohio) in September 2025?

The climate in Hamilton during September can be summarized as warm and reasonably dry.

September is in the fall / autumn in Hamilton and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (78°F), whilst at night 13°C (55°F) is normal.

Hamilton weather averages (imperial / metric)
Daytime temperature 25.7°C 78.3°F
Nightly temperature 12.7°C 54.9°F
Average temperature 19.2°C 66.6°F
Daily sunshine 8.5 hrs
Avg rainfall 70 mm 2.8 ins
Rainy days 8 days
Sea temperature 22°C 71.7°F
Humidity 73%
Windspeed 12.6kph 8 mph

On average September is the 4th driest month of the year in Hamilton with around 70mm 2.8 inches of rain making it a reasonably dry 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 8.5 hours of sunshine per day.

September temperatures in Hamilton

Hamilton average temperature in September

September rainfall

Hamilton average rain in September

September hourly sunshine

Hamilton 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 Hamilton 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

Hamilton weather stats

Hamilton weather statistics
Hottest month: July 29.9°C 85.8°F
Driest month: February 60mm 2.4ins
Sunniest month: June 10.2hrs
Coldest month: January 2.3°C 36.1°F
Wettest month: May 105mm 4.1ins
Map showing location of Hamilton (39.3995, -84.56134) Hamilton map pin © Google

Locations nearby

Top United States locations