Yellowstone National Park weather in August
August in Yellowstone National Park: nice, a little rain, with clean air — one of the best months to visit.
#1 of 12 months in Yellowstone National Park · #32 of 604 destinations to visit in August · comfort 93/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Yellowstone National Park climate normals — August
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 19°C / 66°F | |
| Rainfall | 55 mm / 2.2 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 60% | 💧 humid |
| Dew point | 6°C / 43°F | |
| Sunshine | 11.7 h/day | |
| Daylight | 14 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Yellowstone National Park in August — FAQ
- Is August a good time to visit Yellowstone National Park?
- August in Yellowstone National Park: nice, a little rain, with clean air — one of the best months to visit. It ranks #1 of 12 months for Yellowstone National Park on SeasonMap's comfort score (93/100).
- What is the weather like in Yellowstone National Park in August?
- In August, Yellowstone National Park averages a daily high of 22°C and a low of 8.8°C, with about 54.7 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Yellowstone National Park in August?
- Yellowstone National Park has a mean US Air Quality Index of about 46 in August.