Late summer · Weather & things to do
Indianapolis in August
Little changes in Indianapolis from July: highs stay near 83°F (29°C), lows near 64°F (18°C), and about 3.7 in (95 mm) of rain falls.
It scores 78/100 for comfort, 5th of 12, which makes it a solid shoulder-season month.
- Avg high
- 83°F (29°C)
- Avg low
- 64°F (18°C)
- Rain
- 3.7 in (95 mm)
- Humidity
- 75%
- Cloud cover
- 48%
- Daylight
- ~13 h 34 min
- Comfort score
- 78/100 · Great
What August feels like
Days are warm, averaging 83°F (29°C).
Lows average 64°F (18°C).
With 75% average humidity, it feels muggy.
Some rain is likely, about 3.7 in (95 mm) in the month, so pack for a shower or two.
Plan around August
August is shoulder season: good weather, a step below the best months (September & October).
- Comfort improves from 72/100 in July to 78/100.
- August sits inside the May – Oct window our Indiana & Ohio City-Nature Loop recommends.
What to pack for August
- Light, breathable clothes83°F afternoons
- Sunscreen, sunglasses and a hathigh UV on clear days
- Quick-dry fabrics75% average humidity
- Packable rain jacket or umbrellaabout 3.7 in of rain
- Comfortable walking shoesmost picks involve some walking
What to do in Indianapolis in August
August is good outdoor weather here, so these picks lean toward the open air.
St. Elmo Steak House
Downtown steakhouse since 1902, famous for a fiery horseradish shrimp cocktail.
Indianapolis Motor Speedway Museum
Race cars and Indy 500 history at the speedway; grounds tours often run.
Indianapolis Cultural Trail
8-mile protected bike and walking path linking downtown's cultural districts.
Why now August scores 78/100 for comfort, good conditions for being outside.
Newfields
Indianapolis Museum of Art plus 100+ acres of gardens and the Lilly House.
Sun King Brewery
Downtown taproom of one of Indiana's best-known craft breweries.
Nearby in August
- Broad Ripple in August~7 mi · highs 83°F, 3.7 in rain · similar daytime temperatures, about as wet
- Downtown Cincinnati in August~99 mi · highs 88°F, 3.1 in rain · 2°C (4°F) warmer by day, drier
- Louisville in August~107 mi · highs 87°F, 3.3 in rain · 2°C (4°F) warmer by day, about as wet
- Indiana Dunes in August~138 mi · highs 82°F, 4.3 in rain · similar daytime temperatures, about as wet
These averages also cover Downtown Indianapolis.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Indianapolis in August: quick answers
Is August a good time to visit Indianapolis?
It's a good shoulder-season choice, scoring 78/100 against a best of 89 in September & October. Expect highs of 83°F (29°C) and 3.7 in (95 mm) of rain. August is inside the May – Oct window our Indiana & Ohio City-Nature Loop recommends.
How hot is Indianapolis in August?
Average highs are 83°F (29°C) and average lows 64°F (18°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Indianapolis in August?
Some: about 3.7 in (95 mm) of rain falls across August on average, the 5th-wettest month of the year. The annual total is about 44.9 in (1141 mm).
What should I pack for Indianapolis in August?
Bring light, breathable clothes (83°F afternoons), sunscreen, sunglasses and a hat (high UV on clear days), quick-dry fabrics (75% average humidity), packable rain jacket or umbrella (about 3.7 in of rain) and comfortable walking shoes (most picks involve some walking).
More on Indianapolis
Routes in season in August
- Indiana & Ohio City-Nature Loop May – Oct
Planning Indianapolis in August?
Share this August plan with your group, poll everyone on dates and keep the packing list in one place.