Grand Canyon National Park weather in August
August in Grand Canyon National Park: sweltering, a little rain, with clean air — one of the weakest months to visit.
#11 of 12 months in Grand Canyon National Park · #574 of 604 destinations to visit in August · comfort 42/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Grand Canyon National Park climate normals — August
| Daytime high | 37°C / 99°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 24°C / 74°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 35 mm / 1.4 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 48% | 🍃 comfortable |
| Dew point | 15°C / 59°F | |
| Sunshine | 12.2 h/day | |
| Daylight | 13.5 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Grand Canyon National Park in August — FAQ
- Is August a good time to visit Grand Canyon National Park?
- August in Grand Canyon National Park: sweltering, a little rain, with clean air — one of the weakest months to visit. It ranks #11 of 12 months for Grand Canyon National Park on SeasonMap's comfort score (42/100).
- What is the weather like in Grand Canyon National Park in August?
- In August, Grand Canyon National Park averages a daily high of 37.1°C and a low of 23.6°C, with about 34.5 mm of rain over roughly 7.8 rainy days.
- What is the air quality in Grand Canyon National Park in August?
- Grand Canyon National Park has a mean US Air Quality Index of about 37 in August.