Fort Irwin, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Fort Irwin, a community in San Bernardino County, California.

This Afternoon

71°F

Sunny

Sunny. High near 71, with temperatures falling to around 68 in the afternoon. South southwest wind around 7 mph.

7-day forecast for Fort Irwin

When	Temp	Forecast	Wind	Precip
This Afternoon	71°F	Sunny	7 mph SSW	0%
Tonight	47°F	Clear	6 to 13 mph WSW	0%
Wednesday	71°F	Sunny	2 to 8 mph NNW	0%
Wednesday Night	47°F	Mostly Clear	0 to 5 mph NNW	0%
Thursday	72°F	Mostly Sunny	1 to 6 mph NNE	0%
Thursday Night	48°F	Mostly Clear	1 to 5 mph NNW	0%
Friday	74°F	Sunny	3 to 10 mph N	0%
Friday Night	49°F	Clear	3 to 7 mph N	0%
Saturday	75°F	Sunny	6 mph NNE	0%
Saturday Night	50°F	Clear	1 to 5 mph N	0%
Sunday	76°F	Sunny	0 to 6 mph ENE	0%
Sunday Night	53°F	Partly Cloudy	0 to 3 mph N	0%
Monday	76°F	Mostly Sunny	0 to 3 mph SE	0%
Monday Night	52°F	Partly Cloudy	2 mph WNW	0%

Forecast source: National Weather Service (api.weather.gov) for Fort Irwin (35.248, -116.683). Updated through the day.

Growing snapshot for Fort Irwin

Last spring frost

Feb 19

First fall frost

Nov 26

Growing season

279 days

Hardiness zone

More local growing data for Fort Irwin: nearby ZIP 92310 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Barstow Daggett Ap, Ca (33.2 mi from Fort Irwin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.