Walnut Creek, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut Creek, a city in Contra Costa County, California.
This Afternoon
85°F
Sunny
Sunny. High near 85, with temperatures falling to around 83 in the afternoon. West northwest wind 5 to 8 mph.
7-day forecast for Walnut Creek
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Sunny | 5 to 8 mph WNW | 0% |
| Tonight | 57°F | Mostly Clear | 7 mph SSW | 0% |
| Saturday | 89°F | Sunny | 7 mph SW | 0% |
| Saturday Night | 57°F | Partly Cloudy | 7 mph SSW | 0% |
| Sunday | 79°F | Partly Sunny | 8 mph SW | 2% |
| Sunday Night | 56°F | Mostly Cloudy | 8 mph SW | 2% |
| Monday | 81°F | Sunny | 9 mph WSW | 0% |
| Monday Night | 57°F | Mostly Clear | 6 to 9 mph SW | 0% |
| Tuesday | 85°F | Sunny | 7 mph WSW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 2 to 7 mph SW | 0% |
| Wednesday | 96°F | Sunny | 1 to 5 mph W | 0% |
| Wednesday Night | 62°F | Mostly Clear | 5 mph WSW | 0% |
| Thursday | 97°F | Sunny | 1 to 7 mph WSW | 0% |
| Thursday Night | 62°F | Mostly Clear | 3 to 7 mph WSW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Walnut Creek (37.903, -122.040). Updated through the day.
Growing snapshot for Walnut Creek
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
More local growing data for Walnut Creek: nearby ZIP 94596 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.8 mi from Walnut Creek). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.