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
70°F
Mostly Clear
Mostly clear, with a low around 70. Southeast wind around 0 mph.
7-day forecast for San Bernardino
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 100°F | Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 70°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 99°F | Sunny | 0 to 10 mph S | 0% |
| Wednesday Night | 70°F | Mostly Clear | 0 to 10 mph S | 0% |
| Thursday | 102°F | Sunny | 0 to 5 mph SW | 2% |
| Thursday Night | 71°F | Mostly Clear | 0 to 5 mph W | 2% |
| Friday | 103°F | Sunny | 0 to 5 mph W | 1% |
| Friday Night | 72°F | Mostly Clear | 0 to 5 mph W | 1% |
| Saturday | 103°F | Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 72°F | Mostly Clear | 0 to 5 mph SW | 1% |
| Sunday | 102°F | Sunny | 0 to 10 mph S | 2% |
| Sunday Night | 71°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Monday | 98°F | Sunny | 0 to 10 mph SW | 5% |
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 Aug 4, 2026.