St. Louis weather in April
April in St. Louis: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in St. Louis · #328 of 897 destinations to visit in April · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Louis in April
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St. Louis climate normals — April
| Daytime high | 20°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Rainfall | 110 mm / 4.3 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 60% | 🍃 comfortable |
| Dew point | 5°C / 41°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 13.2 h | |
| Wind | 20 km/h / 13 mph | |
| Snowfall | 0.5 cm / 0.2 in | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Louis in April — FAQ
- Is April a good time to visit St. Louis?
- April in St. Louis: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for St. Louis on SeasonMap's comfort score (84/100).
- What is the weather like in St. Louis in April?
- In April, St. Louis averages a daily high of 19.6°C and a low of 8°C, with about 110.2 mm of rain over roughly 11.6 rainy days.
- What is the air quality in St. Louis in April?
- St. Louis has a mean US Air Quality Index of about 42 in April.