Boonville Weather in September

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

The climate in Boonville during September can be summarized as warm, humid and reasonably dry.

September is in the fall / autumn in Boonville and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (81°F), whilst at night 14°C (58°F) is normal.

Boonville weather averages (imperial / metric)
Daytime temperature 27.3°C 81.1°F
Nightly temperature 14.2°C 57.5°F
Average temperature 20.7°C 69.3°F
Daily sunshine 8.8 hrs
Avg rainfall 80 mm 3.1 ins
Rainy days 8 days
Sea temperature 22.1°C 71.8°F
Humidity 73%
Windspeed 11.2kph 7 mph

On average September is the 3rd driest month of the year in Boonville with around 80mm 3.1 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 8.8 hours of sunshine per day.

September temperatures in Boonville

Boonville average temperature in September

September rainfall

Boonville average rain in September

September hourly sunshine

Boonville 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 Boonville 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

Boonville weather stats

Boonville weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: January 74mm 2.9ins
Sunniest month: August 10.2hrs
Coldest month: January 3.9°C 39°F
Wettest month: May 125mm 4.9ins
Map showing location of Boonville (38.04921, -87.27417) Boonville map pin © Google

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