Joshua Tree National Park in September
Joshua Tree National Park · crowd + weather almanac
September crowd level
moderate
about 157,000 visits in a
typical September
The 10th-busiest month of the year ·
median of 2016–2025 official NPS counts
September is the 10th-busiest month of the year at Joshua Tree National Park: about 157,000 recreation visits in a typical September (5% of the year's traffic, and 39% of what the peak month, March, sees). Crowds are middling — noticeably lighter than peak season. Weather-wise, September days at the Twentynine Palms, CA station typically top out around 96°F with nights near 69°F, and about 0.3 inches of precipitation falls over the month.
- Typical September: 157,241 recreation visits (median 2016–2025); the range across those years ran 148,905 (2025) to 189,383 (2023).
- Busier than 2 of the other 11 months.
- 1991–2020 September normals at Twentynine Palms, CA: high 96°F, low 69°F, 0.34 in precipitation.
September weather (1991–2020 normals)
| Typical daytime high | 96°F |
|---|---|
| Typical overnight low | 69°F |
| Precipitation (monthly normal) | 0.34 in |
| Measured at | Twentynine Palms, CA (USC00049099), 0.1 mi from the park reference point, elev. 1,975 ft |
Every month at Joshua Tree
| Month | Typical visits | Crowds | High / Low | Precip |
|---|---|---|---|---|
| January | 259,925 | busy | 63°F / 42°F | 0.5 in |
| February | 287,039 | busy | 67°F / 44°F | 0.6 in |
| March | 404,626 | busiest stretch | 74°F / 49°F | 0.3 in |
| April | 351,253 | busiest stretch | 81°F / 54°F | 0.1 in |
| May | 239,057 | moderate | 90°F / 63°F | 0.1 in |
| June | 165,391 | moderate | 99°F / 71°F | 0.0 in |
| July | 139,315 | quiet | 104°F / 77°F | 0.4 in |
| August | 142,177 | moderate | 103°F / 76°F | 0.7 in |
| September | 157,241 | moderate | 96°F / 69°F | 0.3 in |
| October | 221,930 | moderate | 85°F / 58°F | 0.1 in |
| November | 304,711 | busy | 72°F / 47°F | 0.2 in |
| December | 314,587 | busy | 62°F / 40°F | 0.6 in |