St. Louis weather in October
October in St. Louis: nice, rainy, with clean air — an excellent time to visit.
#4 of 12 months in St. Louis · #343 of 897 destinations to visit in October · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Louis in October
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St. Louis climate normals — October
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Rainfall | 102 mm / 4 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 61% | 💧 humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 7.5 h/day | |
| Daylight | 11.2 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 0.2 cm / 0.1 in | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Louis in October — FAQ
- Is October a good time to visit St. Louis?
- October in St. Louis: nice, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for St. Louis on SeasonMap's comfort score (83/100).
- What is the weather like in St. Louis in October?
- In October, St. Louis averages a daily high of 20.3°C and a low of 10.7°C, with about 101.5 mm of rain over roughly 9.6 rainy days.
- What is the air quality in St. Louis in October?
- St. Louis has a mean US Air Quality Index of about 36 in October.