Mount Rainier National Park weather in May
May in Mount Rainier National Park: cold, rainy, with clean air — a great time to visit.
#5 of 12 months in Mount Rainier National Park · #437 of 604 destinations to visit in May · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Mount Rainier National Park climate normals — May
| Daytime high | 4°C / 39°F | 🧥 cold |
|---|---|---|
| Nighttime low | -5°C / 24°F | |
| Feels like (high) | 1°C / 34°F | |
| Rainfall | 116 mm / 4.6 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | -4°C / 24°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 15.1 h | |
| Wind | 11 km/h / 7 mph | |
| Snowfall | 9.2 cm / 3.6 in | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Mount Rainier National Park?
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Mount Rainier National Park in May — FAQ
- Is May a good time to visit Mount Rainier National Park?
- May in Mount Rainier National Park: cold, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Mount Rainier National Park on SeasonMap's comfort score (73/100).
- What is the weather like in Mount Rainier National Park in May?
- In May, Mount Rainier National Park averages a daily high of 3.9°C and a low of -4.7°C, with about 116.3 mm of rain over roughly 17.2 rainy days.
- What is the air quality in Mount Rainier National Park in May?
- Mount Rainier National Park has a mean US Air Quality Index of about 41 in May.
- Does it snow in Mount Rainier National Park in May?
- Mount Rainier National Park sees roughly 9.2 cm of snowfall in May.