Yellowstone National Park weather in May
May in Yellowstone National Park: cold, a little rain, with very humid — a great time to visit.
#5 of 12 months in Yellowstone National Park · #412 of 604 destinations to visit in May · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Yellowstone National Park climate normals — May
| Daytime high | 8°C / 46°F | 🧥 cold |
|---|---|---|
| Nighttime low | -1°C / 29°F | |
| Feels like (high) | 5°C / 41°F | |
| Rainfall | 73 mm / 2.9 in | 🌦 some rain |
| Rainy days | 17 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | -2°C / 29°F | |
| Sunshine | 11.8 h/day | |
| Daylight | 14.8 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 29.2 cm / 11.5 in | |
| Air quality (US AQI) | 58 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Yellowstone National Park in May — FAQ
- Is May a good time to visit Yellowstone National Park?
- May in Yellowstone National Park: cold, a little rain, with very humid — a great time to visit. It ranks #5 of 12 months for Yellowstone National Park on SeasonMap's comfort score (76/100).
- What is the weather like in Yellowstone National Park in May?
- In May, Yellowstone National Park averages a daily high of 7.5°C and a low of -1.5°C, with about 73.2 mm of rain over roughly 16.8 rainy days.
- What is the air quality in Yellowstone National Park in May?
- Yellowstone National Park has a mean US Air Quality Index of about 58 in May.
- Does it snow in Yellowstone National Park in May?
- Yellowstone National Park sees roughly 29.2 cm of snowfall in May.