Rialto, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rialto, a city in San Bernardino County, California.
Today
97°F
Sunny
Sunny, with a high near 97. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for Rialto
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Sunny | 5 to 10 mph SW | 0% |
| Tonight | 69°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 96°F | Sunny | 0 to 10 mph S | 0% |
| Wednesday Night | 70°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Thursday | 99°F | Sunny | 0 to 10 mph SW | 2% |
| Thursday Night | 71°F | Mostly Clear | 0 to 10 mph W | 2% |
| Friday | 100°F | Sunny | 0 to 10 mph SW | 0% |
| Friday Night | 71°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Saturday | 101°F | Sunny | 0 to 10 mph SW | 1% |
| Saturday Night | 72°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Sunday | 100°F | Sunny | 0 to 10 mph SW | 1% |
| Sunday Night | 70°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Monday | 96°F | Sunny | 0 to 10 mph SW | 4% |
| Monday Night | 68°F | Mostly Clear | 0 to 10 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Rialto (34.117, -117.389). Updated through the day.
Growing snapshot for Rialto
Last spring frost
Jan 10
First fall frost
Jan 2
Growing season
365 days
Hardiness zone
10a
More local growing data for Rialto: nearby ZIP 92376 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Riverside Citrus Exp, Ca (10 mi from Rialto). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.