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
81°F
Sunny
Sunny, with a high near 81. West southwest wind 5 to 10 mph.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Sunny | 5 to 10 mph WSW | 0% |
| Tonight | 59°F | Mostly Clear | 5 mph SSW | 0% |
| Saturday | 83°F | Sunny | 5 to 10 mph SSW | 0% |
| Saturday Night | 61°F | Patchy Fog | 0 to 5 mph SW | 0% |
| Sunday | 83°F | Patchy Fog then Partly Sunny | 5 to 10 mph SW | 0% |
| Sunday Night | 60°F | Partly Cloudy | 5 mph SSW | 1% |
| Monday | 79°F | Mostly Sunny | 5 to 10 mph SSW | 1% |
| Monday Night | 61°F | Mostly Clear | 0 to 10 mph SW | 1% |
| Tuesday | 82°F | Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 63°F | Clear | 0 to 10 mph NW | 0% |
| Wednesday | 90°F | Sunny | 0 to 10 mph WNW | 1% |
| Wednesday Night | 65°F | Mostly Clear | 0 to 10 mph SW | 3% |
| Thursday | 91°F | Sunny | 0 to 10 mph SW | 2% |
| Thursday Night | 67°F | Mostly Clear | 0 to 10 mph WSW | 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 Sep 19, 2026.