Winchester, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a community in Riverside County, California.
Overnight
66°F
Mostly Clear
Mostly clear, with a low around 66. West wind around 0 mph.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 99°F | Sunny | 0 to 15 mph SW | 1% |
| Tuesday Night | 66°F | Mostly Clear | 0 to 15 mph W | 1% |
| Wednesday | 97°F | Sunny | 0 to 15 mph SW | 1% |
| Wednesday Night | 66°F | Mostly Clear | 0 to 15 mph S | 0% |
| Thursday | 99°F | Sunny | 0 to 10 mph SW | 1% |
| Thursday Night | 68°F | Mostly Clear | 0 to 10 mph S | 1% |
| Friday | 100°F | Sunny | 0 to 10 mph SW | 0% |
| Friday Night | 68°F | Mostly Clear | 0 to 10 mph S | 0% |
| Saturday | 102°F | Sunny | 0 to 10 mph SW | 0% |
| Saturday Night | 68°F | Mostly Clear | 0 to 10 mph S | 0% |
| Sunday | 101°F | Sunny | 0 to 15 mph S | 2% |
| Sunday Night | 67°F | Mostly Clear | 0 to 15 mph S | 1% |
| Monday | 97°F | Sunny | 0 to 15 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Winchester (33.715, -117.077). Updated through the day.
Growing snapshot for Winchester
Last spring frost
Jan 31
First fall frost
Dec 10
Growing season
315 days
Hardiness zone
9b
More local growing data for Winchester: nearby ZIP 92545 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, San Jacinto, Ca (5.7 mi from Winchester). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.