Winchester, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a community in Riverside County, California.
This Afternoon
89°F
Sunny
Sunny, with a high near 89. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 89°F | Sunny | 5 to 15 mph SW | 0% |
| Tonight | 61°F | Mostly Clear | 0 to 15 mph SW | 0% |
| Sunday | 86°F | Mostly Sunny | 0 to 15 mph W | 0% |
| Sunday Night | 60°F | Partly Cloudy | 0 to 10 mph S | 1% |
| Monday | 81°F | Mostly Sunny | 0 to 15 mph SW | 1% |
| Monday Night | 58°F | Mostly Clear | 0 to 10 mph S | 0% |
| Tuesday | 84°F | Sunny | 0 to 10 mph W | 0% |
| Tuesday Night | 61°F | Clear | 0 to 10 mph S | 0% |
| Wednesday | 93°F | Sunny | 0 to 10 mph NW | 0% |
| Wednesday Night | 64°F | Clear | 0 to 10 mph NE | 0% |
| Thursday | 95°F | Sunny | 0 to 10 mph SW | 6% |
| Thursday Night | 65°F | Mostly Clear | 0 to 10 mph E | 5% |
| Friday | 93°F | Sunny | 0 to 5 mph S | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph SE | 2% |
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 Sep 19, 2026.