Flash flooding and storm-driven hazards are the dominant threat at Joshua Tree, with Riverside County recording 11 flood events, 9 thunderstorm wind events, and 5 heavy rain episodes in recent years — a reminder that this desert landscape offers almost no natural shelter when fast-moving storms roll through. The surrounding county also logged a violent crime rate of 526.5 per 100,000 residents in 2023, which warrants keeping valuables out of sight at campsites.
When storms are in the forecast, move your tent or RV away from dry washes and low-lying areas before nightfall, since flash floods can arrive with little warning even when skies look clear overhead. Pack a weather radio or download an offline alert app, as cell coverage inside the park is unreliable. Store laptops, cameras, and cash in a locked vehicle rather than leaving them unattended at your site during day hikes.
Top recorded hazards in Riverside County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Flood 11
- Thunderstorm Wind 9
- Heavy Rain 5
- Hail 4
- Flash Flood 1
- Lightning 1
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About Joshua Tree National Park
Two distinct desert ecosystems, the Mojave and the Colorado, come together in Joshua Tree National Park. A fascinating variety of plants and animals make their homes in a land sculpted by strong winds and occasional torrents of rain. Dark night skies, a rich cultural history, and surreal geologic features add to the wonder of this vast wilderness in southern California. Come explore for yourself!
Weather
Days are typically clear with less than 25% humidity. Temperatures are most comfortable in the spring and fall, with an average highs around 85°F (29°C) and average lows around 50°F (10°C) respectively. Winter brings cooler days, around 60°F (15°C), and freezing nights. It occasionally snows at higher elevations. Summers are hot, over 100°F (38°C) during the day and not cooling much below 75°F (24°C) at night.