Gateway Arch National Park weather in April
April in Gateway Arch National Park: nice, rainy, with clean air — one of the best months to visit.
#1 of 12 months in Gateway Arch National Park · #84 of 604 destinations to visit in April · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Gateway Arch National Park climate normals — April
| Daytime high | 20°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 47°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 114 mm / 4.5 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 / 12 mph | |
| Snowfall | 0.4 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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Gateway Arch National Park in April — FAQ
- Is April a good time to visit Gateway Arch National Park?
- April in Gateway Arch National Park: nice, rainy, with clean air — one of the best months to visit. It ranks #1 of 12 months for Gateway Arch National Park on SeasonMap's comfort score (89/100).
- What is the weather like in Gateway Arch National Park in April?
- In April, Gateway Arch National Park averages a daily high of 19.6°C and a low of 8.1°C, with about 114.1 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Gateway Arch National Park in April?
- Gateway Arch National Park has a mean US Air Quality Index of about 42 in April.