Grand Canyon National Park weather in September
September in Grand Canyon National Park: hot, dry, with clean air — a fair time to visit.
#9 of 12 months in Grand Canyon National Park · #519 of 604 destinations to visit in September · comfort 59/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Grand Canyon National Park climate normals — September
| Daytime high | 34°C / 93°F | 🥵 hot |
|---|---|---|
| Nighttime low | 20°C / 68°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 22 mm / 0.9 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 38% | 🌵 dry |
| Dew point | 8°C / 47°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.4 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 38 | 🍃 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 September — FAQ
- Is September a good time to visit Grand Canyon National Park?
- September in Grand Canyon National Park: hot, dry, with clean air — a fair time to visit. It ranks #9 of 12 months for Grand Canyon National Park on SeasonMap's comfort score (59/100).
- What is the weather like in Grand Canyon National Park in September?
- In September, Grand Canyon National Park averages a daily high of 33.8°C and a low of 20°C, with about 21.9 mm of rain over roughly 4.6 rainy days.
- What is the air quality in Grand Canyon National Park in September?
- Grand Canyon National Park has a mean US Air Quality Index of about 38 in September.