Joshua Tree National Park Temperatures by Season

Spring (Mar–May): Days 58–78°F (Apr warmest); nights cool.

Summer (Jun–Aug): Days ~110°F avg; nights ~80°F—extreme heat.

Autumn (Sep–Nov): Days 80s–90s°F; nights 50s–40s°F; Sep/Oct wettest.

Winter (Dec–Feb): Days 55–70°F; nights ~30°F (Dec/Jan coldest).

Wide diurnal swings year-round; summer dangerously hot, winter nights freezing. Carry water, layers, sun protection.