Indianapolis Weather in August

What's the weather like in Indianapolis (Indiana) in August 2025?

The climate in Indianapolis during August can be summarized as warm, humid and a little damp.

August is in the summer in Indianapolis and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (84°F), whilst at night 17°C (62°F) is normal.

Indianapolis weather averages (imperial / metric)
Daytime temperature 28.8°C 83.8°F
Nightly temperature 16.6°C 61.9°F
Average temperature 22.7°C 72.9°F
Daily sunshine 9.6 hrs
Avg rainfall 93 mm 3.6 ins
Rainy days 9 days
Sea temperature 23.6°C 74.5°F
Humidity 74%
Windspeed 11.9kph 7 mph

On average August is the 4th wettest month of the year in Indianapolis with around 93mm 3.6 inches of rain making it a a little damp 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 9.6 hours of sunshine per day.

August temperatures in Indianapolis

Indianapolis average temperature in August

August rainfall

Indianapolis average rain in August

August hourly sunshine

Indianapolis average rain in August

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 Indianapolis in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Indianapolis weather stats

Indianapolis weather statistics
Hottest month: July 29.6°C 85.3°F
Driest month: January 61mm 2.4ins
Sunniest month: July 10.3hrs
Coldest month: January 0.7°C 33.3°F
Wettest month: July 119mm 4.7ins
Map showing location of Indianapolis (39.76838, -86.15804) Indianapolis map pin © Google

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