Rockville Weather in September

What's the weather like in Rockville (Indiana) in September 2025?

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

September is in the fall / autumn in Rockville and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 13°C (55°F) is normal.

Rockville weather averages (imperial / metric)
Daytime temperature 26.3°C 79.3°F
Nightly temperature 13°C 55.3°F
Average temperature 19.6°C 67.3°F
Daily sunshine 8.6 hrs
Avg rainfall 81 mm 3.2 ins
Rainy days 8 days
Sea temperature 21.3°C 70.4°F
Humidity 73%
Windspeed 13.3kph 8 mph

On average September is the 4th driest month of the year in Rockville with around 81mm 3.2 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 8.6 hours of sunshine per day.

September temperatures in Rockville

Rockville average temperature in September

September rainfall

Rockville average rain in September

September hourly sunshine

Rockville 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 Rockville 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

Rockville weather stats

Rockville weather statistics
Hottest month: July 30.3°C 86.5°F
Driest month: February 56mm 2.2ins
Sunniest month: July 10.7hrs
Coldest month: January 1.4°C 34.5°F
Wettest month: July 121mm 4.8ins
Map showing location of Rockville (39.76254, -87.22918) Rockville map pin © Google

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