San Bernardino, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Bernardino, a city in San Bernardino County, California.
Overnight
53°F
Mostly Clear
Mostly clear, with a low around 53. Northeast wind around 0 mph.
7-day forecast for San Bernardino
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Clear | 0 mph | 2% |
| Wednesday | 74°F | Sunny | 0 mph | 1% |
| Wednesday Night | 54°F | Mostly Clear | 0 to 10 mph NE | 0% |
| Thursday | 78°F | Mostly Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 57°F | Partly Cloudy | 0 to 10 mph N | 0% |
| Friday | 80°F | Sunny | 5 to 10 mph N | 0% |
| Friday Night | 57°F | Clear | 10 to 15 mph NE | 0% |
| Saturday | 81°F | Sunny | 0 to 10 mph N | 0% |
| Saturday Night | 58°F | Clear | 0 to 15 mph N | 0% |
| Sunday | 82°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 59°F | Mostly Clear | 0 to 10 mph N | 0% |
| Monday | 81°F | Sunny | 0 to 5 mph N | 0% |
| Monday Night | 58°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Tuesday | 79°F | Sunny | 0 mph | 3% |
Forecast source: National Weather Service (api.weather.gov) for San Bernardino (34.141, -117.295). Updated through the day.
Growing snapshot for San Bernardino
Last spring frost
May 5
First fall frost
Nov 2
Growing season
176 days
Hardiness zone
10a
More local growing data for San Bernardino: nearby ZIP 92405 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lake Arrowhead, Ca (9.5 mi from San Bernardino). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.