Zion National Park weather in September
September in Zion National Park: warm, dry, with clean air — an excellent time to visit.
#4 of 12 months in Zion National Park · #124 of 604 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Zion National Park climate normals — September
| Daytime high | 27°C / 81°F | 🌤 warm |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 18 mm / 0.7 in | ☀️ dry |
| Rainy days | 3 days | |
| Humidity | 41% | 🍃 comfortable |
| Dew point | 4°C / 40°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.4 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Zion National Park in September — FAQ
- Is September a good time to visit Zion National Park?
- September in Zion National Park: warm, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Zion National Park on SeasonMap's comfort score (88/100).
- What is the weather like in Zion National Park in September?
- In September, Zion National Park averages a daily high of 27.1°C and a low of 13.2°C, with about 17.9 mm of rain over roughly 3 rainy days.
- What is the air quality in Zion National Park in September?
- Zion National Park has a mean US Air Quality Index of about 41 in September.