Joshua Tree National Park weather in September
September in Joshua Tree National Park: hot, dry, with clean air — a fair time to visit.
#9 of 12 months in Joshua Tree National Park · #547 of 604 destinations to visit in September · comfort 55/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Joshua Tree National Park climate normals — September
| Daytime high | 35°C / 94°F | 🥵 hot |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 12 mm / 0.5 in | ☀️ dry |
| Rainy days | 2 days | |
| Humidity | 36% | 🌵 dry |
| Dew point | 9°C / 48°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Joshua Tree National Park?
Loading map…
Joshua Tree National Park in September — FAQ
- Is September a good time to visit Joshua Tree National Park?
- September in Joshua Tree National Park: hot, dry, with clean air — a fair time to visit. It ranks #9 of 12 months for Joshua Tree National Park on SeasonMap's comfort score (55/100).
- What is the weather like in Joshua Tree National Park in September?
- In September, Joshua Tree National Park averages a daily high of 34.5°C and a low of 21.9°C, with about 11.9 mm of rain over roughly 1.8 rainy days.
- What is the air quality in Joshua Tree National Park in September?
- Joshua Tree National Park has a mean US Air Quality Index of about 49 in September.