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.
Tonight
61°F
Clear
Clear. Low around 61, with temperatures rising to around 63 overnight. West northwest wind around 5 mph.
7-day forecast for Fort Irwin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Clear | 5 mph WNW | 0% |
| Saturday | 92°F | Sunny | 1 to 5 mph NNE | 0% |
| Saturday Night | 65°F | Mostly Clear | 0 mph | 0% |
| Sunday | 93°F | Mostly Sunny | 0 to 7 mph E | 0% |
| Sunday Night | 67°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Monday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph SSW | 31% |
| Monday Night | 64°F | Chance Showers And Thunderstorms then Mostly Clear | 1 to 7 mph W | 31% |
| Tuesday | 90°F | Sunny | 1 to 5 mph NE | 1% |
| Tuesday Night | 66°F | Clear | 0 to 3 mph NNE | 0% |
| Wednesday | 94°F | Sunny | 0 to 7 mph ENE | 1% |
| Wednesday Night | 68°F | Clear | 0 to 5 mph NE | 1% |
| Thursday | 95°F | Sunny | 0 to 7 mph ESE | 3% |
| Thursday Night | 68°F | Mostly Clear | 0 to 5 mph SE | 4% |
| Friday | 94°F | Sunny | 0 to 7 mph SSW | 6% |
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
9a
More local growing data for Fort Irwin: nearby ZIP 92310 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Adelanto
Apple Valley
Baker
Barstow
Big Bear City
Big Bear Lake
Big River
Bloomington
Bluewater
Chino
Chino Hills
Colton
Crestline
Fontana
Grand Terrace
Hesperia
Highland
Homestead Valley
Homewood Canyon
Joshua Tree
Lake Arrowhead
Lenwood
Loma Linda
Lucerne Valley
Lytle Creek
Mentone
Montclair
Morongo Valley
Mountain View Acres
Muscoy
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 Sep 19, 2026.