Glacier National Park weather in May
May in Glacier National Park: cold, rainy, with clean air — a great time to visit.
#5 of 12 months in Glacier National Park · #373 of 604 destinations to visit in May · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Glacier National Park climate normals — May
| Daytime high | 9°C / 48°F | 🧥 cold |
|---|---|---|
| Nighttime low | 0°C / 31°F | |
| Feels like (high) | 6°C / 43°F | |
| Rainfall | 84 mm / 3.3 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 0°C / 31°F | |
| Sunshine | 11.5 h/day | |
| Daylight | 15.3 h | |
| Wind | 14 km/h / 8 mph | |
| Snowfall | 27 cm / 10.6 in | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Glacier National Park?
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Glacier National Park in May — FAQ
- Is May a good time to visit Glacier National Park?
- May in Glacier National Park: cold, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Glacier National Park on SeasonMap's comfort score (78/100).
- What is the weather like in Glacier National Park in May?
- In May, Glacier National Park averages a daily high of 8.8°C and a low of -0.3°C, with about 83.8 mm of rain over roughly 12.8 rainy days.
- What is the air quality in Glacier National Park in May?
- Glacier National Park has a mean US Air Quality Index of about 50 in May.
- Does it snow in Glacier National Park in May?
- Glacier National Park sees roughly 27 cm of snowfall in May.