Petrified Forest National Park weather in September
September in Petrified Forest National Park: warm, dry, with clean air — an excellent time to visit.
#4 of 12 months in Petrified Forest National Park · #230 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Petrified Forest National Park climate normals — September
| Daytime high | 29°C / 85°F | 🌤 warm |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 15 mm / 0.6 in | ☀️ dry |
| Rainy days | 3 days | |
| Humidity | 38% | 🌵 dry |
| Dew point | 5°C / 41°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 12.4 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Petrified Forest National Park?
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Petrified Forest National Park in September — FAQ
- Is September a good time to visit Petrified Forest National Park?
- September in Petrified Forest National Park: warm, dry, with clean air — an excellent time to visit. It ranks #4 of 12 months for Petrified Forest National Park on SeasonMap's comfort score (84/100).
- What is the weather like in Petrified Forest National Park in September?
- In September, Petrified Forest National Park averages a daily high of 29.4°C and a low of 15.2°C, with about 14.8 mm of rain over roughly 3.4 rainy days.
- What is the air quality in Petrified Forest National Park in September?
- Petrified Forest National Park has a mean US Air Quality Index of about 38 in September.