Gateway Arch National Park weather in January
January in Gateway Arch National Park: cold, rainy, with clean air — a good time to visit.
#11 of 12 months in Gateway Arch National Park · #341 of 604 destinations to visit in January · comfort 66/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Gateway Arch National Park climate normals — January
| Daytime high | 6°C / 42°F | 🧥 cold |
|---|---|---|
| Nighttime low | -2°C / 28°F | |
| Feels like (high) | 2°C / 36°F | |
| Rainfall | 91 mm / 3.6 in | 🌧 rainy |
| Rainy days | 8 days | |
| Humidity | 66% | 💧 humid |
| Dew point | -5°C / 23°F | |
| Sunshine | 5.2 h/day | |
| Daylight | 9.8 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 14.4 cm / 5.7 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 January — FAQ
- Is January a good time to visit Gateway Arch National Park?
- January in Gateway Arch National Park: cold, rainy, with clean air — a good time to visit. It ranks #11 of 12 months for Gateway Arch National Park on SeasonMap's comfort score (66/100).
- What is the weather like in Gateway Arch National Park in January?
- In January, Gateway Arch National Park averages a daily high of 5.6°C and a low of -2.3°C, with about 91.1 mm of rain over roughly 8.4 rainy days.
- What is the air quality in Gateway Arch National Park in January?
- Gateway Arch National Park has a mean US Air Quality Index of about 36 in January.
- Does it snow in Gateway Arch National Park in January?
- Gateway Arch National Park sees roughly 14.4 cm of snowfall in January.