Gateway Arch National Park weather in October
October in Gateway Arch National Park: nice, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Gateway Arch National Park · #95 of 604 destinations to visit in October · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Gateway Arch National Park climate normals — October
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Feels like (high) | 19°C / 66°F | |
| Rainfall | 105 mm / 4.1 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 61% | 💧 humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 7.6 h/day | |
| Daylight | 11.2 h | |
| Wind | 17 km/h / 11 mph | |
| Snowfall | 0.1 cm / 0 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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Gateway Arch National Park in October — FAQ
- Is October a good time to visit Gateway Arch National Park?
- October in Gateway Arch National Park: nice, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Gateway Arch National Park on SeasonMap's comfort score (87/100).
- What is the weather like in Gateway Arch National Park in October?
- In October, Gateway Arch National Park averages a daily high of 20.3°C and a low of 10.8°C, with about 104.9 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Gateway Arch National Park in October?
- Gateway Arch National Park has a mean US Air Quality Index of about 36 in October.