St. Louis weather in May
May in St. Louis: warm, rainy — one of the best months to visit.
#1 of 12 months in St. Louis · #174 of 897 destinations to visit in May · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Louis in May
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St. Louis climate normals — May
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Rainfall | 129 mm / 5.1 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 66% | 💧 humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 14.3 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 53 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Louis in May — FAQ
- Is May a good time to visit St. Louis?
- May in St. Louis: warm, rainy — one of the best months to visit. It ranks #1 of 12 months for St. Louis on SeasonMap's comfort score (90/100).
- What is the weather like in St. Louis in May?
- In May, St. Louis averages a daily high of 24.2°C and a low of 14.4°C, with about 129.3 mm of rain over roughly 13.2 rainy days.
- What is the air quality in St. Louis in May?
- St. Louis has a mean US Air Quality Index of about 53 in May.