Walnut, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a city in Los Angeles County, California.
This Afternoon
73°F
Sunny
Sunny, with a high near 73. West southwest wind around 10 mph.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Sunny | 10 mph WSW | 0% |
| Tonight | 54°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 74°F | Sunny | 0 to 5 mph WSW | 0% |
| Wednesday Night | 55°F | Mostly Clear | 5 mph N | 0% |
| Thursday | 78°F | Sunny | 0 to 10 mph N | 0% |
| Thursday Night | 56°F | Mostly Clear | 0 to 10 mph N | 0% |
| Friday | 80°F | Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 57°F | Clear | 0 to 15 mph NNE | 0% |
| Saturday | 83°F | Sunny | 0 to 10 mph NE | 0% |
| Saturday Night | 60°F | Clear | 0 to 15 mph NNE | 0% |
| Sunday | 85°F | Sunny | 0 to 10 mph NE | 0% |
| Sunday Night | 62°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Monday | 82°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Monday Night | 60°F | Partly Cloudy | 0 to 5 mph NE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Walnut (34.037, -117.856). Updated through the day.
Growing snapshot for Walnut
Last spring frost
Jan 8
First fall frost
Dec 28
Growing season
354 days
Hardiness zone
10a
More local growing data for Walnut: nearby ZIP 91789 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Pomona/Fairplex, Ca (6.7 mi from Walnut). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.