St. Louis weather in August
August in St. Louis: hot, rainy — a great time to visit.
#8 of 12 months in St. Louis · #639 of 897 destinations to visit in August · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Louis in August
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St. Louis climate normals — August
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Rainfall | 133 mm / 5.2 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 20°C / 67°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 13.6 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 64 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Louis in August — FAQ
- Is August a good time to visit St. Louis?
- August in St. Louis: hot, rainy — a great time to visit. It ranks #8 of 12 months for St. Louis on SeasonMap's comfort score (71/100).
- What is the weather like in St. Louis in August?
- In August, St. Louis averages a daily high of 30.1°C and a low of 21.2°C, with about 133.1 mm of rain over roughly 10.8 rainy days.
- What is the air quality in St. Louis in August?
- St. Louis has a mean US Air Quality Index of about 64 in August.