Indianapolis Weather in August
August in Indianapolis typically sees daytime highs of 29°C (84°F) and nighttime lows of 18°C (64°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Indianapolis in August
This month experiences about 10 days of rain according to historical data, averaging 81 mm (3.2 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Indianapolis in August
Indianapolis in August is worth a visit. The temperature is perfect, with 29°C (84°F) during the day and 18°C (64°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With lows of 18°C (64°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Indianapolis in August
The city usually sees around 275 hours of sunlight, indicating many sunny days — a great month for sightseeing.If your ideal day consists of dry skies and pleasant temperatures, August and September typically offer the best circumstances for Indianapolis.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Indianapolis's climate page.
Indianapolis Temperature in August
Min Temperature
18°C (64°F)
Max Temperature
29°C (84°F)
Chance of Rain
35%
Precipitation
81 mm (3.2 in)
Rainy days
10 days
Humidity
76%
Sunshine
275 hours
Percentage Sunshine
64%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Indianapolis typically stay consistent throughout August, with daily highs averaging around 29°C (84°F). Nights are pleasant, with lows typically ranging from 17°C (63°F) to 19°C (66°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Indianapolis in August
Browse day-by-day weather records for Indianapolis spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Indianapolis historical weather extremes in August
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Indianapolis.
- The hottest August day on record in Indianapolis reached 38°C (100°F) (August 16, 1988).
- Indianapolis experienced its chilliest August day on August 12, 2004, reaching only 17°C (63°F).
- The lowest overnight temperature recorded in August was 6°C (43°F) (August 28, 1986).
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
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What to Wear in Indianapolis in August
Warm but pleasant conditions in Indianapolis in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Indianapolis in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Indianapolis's climate page.
Temperature Rainfall Sunshine Humidity
See the full Indianapolis climate overview or explore weather in the United States of America.
