Frankfort Weather in September

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

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

September is in the fall / autumn in Frankfort and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (78°F), whilst at night 12°C (53°F) is normal.

Frankfort weather averages (imperial / metric)
Daytime temperature 25.6°C 78°F
Nightly temperature 11.5°C 52.6°F
Average temperature 18.5°C 65.3°F
Daily sunshine 8.5 hrs
Avg rainfall 77 mm 3 ins
Rainy days 9 days
Sea temperature 20.9°C 69.6°F
Humidity 73%
Windspeed 13.7kph 9 mph

On average September is the 5th driest month of the year in Frankfort with around 77mm 3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 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 Frankfort

Frankfort average temperature in September

September rainfall

Frankfort average rain in September

September hourly sunshine

Frankfort 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 Frankfort 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

Frankfort weather stats

Frankfort weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: February 53mm 2.1ins
Sunniest month: July 10.7hrs
Coldest month: January 0.2°C 32.4°F
Wettest month: July 107mm 4.2ins
Map showing location of Frankfort (40.27948, -86.51084) Frankfort map pin © Google

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