Indianapolis weather in August
August in Indianapolis: warm, rainy — a great time to visit.
#6 of 12 months in Indianapolis · #498 of 897 destinations to visit in August · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Indianapolis in August
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Indianapolis climate normals — August
| Daytime high | 28°C / 83°F | 🌤 warm |
|---|---|---|
| Nighttime low | 20°C / 67°F | |
| Rainfall | 92 mm / 3.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 13.7 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 54 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Indianapolis in August — FAQ
- Is August a good time to visit Indianapolis?
- August in Indianapolis: warm, rainy — a great time to visit. It ranks #6 of 12 months for Indianapolis on SeasonMap's comfort score (79/100).
- What is the weather like in Indianapolis in August?
- In August, Indianapolis averages a daily high of 28.4°C and a low of 19.6°C, with about 91.7 mm of rain over roughly 11 rainy days.
- What is the air quality in Indianapolis in August?
- Indianapolis has a mean US Air Quality Index of about 54 in August.