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Best Time for Southern California: San Diego to Joshua Tree

Last updated: 2026-08-16

Sweet spot: January, February, March. Computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.

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Desert season proper: Joshua Tree's boulders warm without broiling, Palm Springs pools justify themselves, and a wet winter can detonate a spring superbloom.
The desert floor exceeds 40°C daily — the aerial tramway's 2,500-metre top is thirty degrees cooler, and San Diego's coast stays kind.

Month	Low	High	Rain	Daylight
January	4.5°C	16.0°C	26 mm	10.0 h
February	5.2°C	17.3°C	31 mm	10.8 h
March	7.4°C	20.8°C	15 mm	11.7 h
April	9.4°C	23.7°C	9 mm	12.9 h
May	13.0°C	28.0°C	3 mm	13.8 h
June	17.1°C	33.1°C	5 mm	14.2 h
July	21.3°C	35.7°C	7 mm	14.0 h
August	21.2°C	35.3°C	8 mm	13.3 h
September	18.7°C	32.6°C	6 mm	12.2 h
October	13.4°C	26.5°C	10 mm	11.1 h
November	8.5°C	20.5°C	14 mm	10.2 h
December	4.3°C	15.3°C	29 mm	9.8 h

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