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.
Overnight
59°F
Clear
Clear, with a low around 59. Southwest wind around 5 mph.
7-day forecast for Walnut Creek
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Clear | 5 mph SW | 0% |
| Tuesday | 102°F | Sunny | 5 to 9 mph SW | 0% |
| Tuesday Night | 59°F | Clear | 5 to 8 mph SW | 0% |
| Wednesday | 96°F | Sunny | 8 mph WSW | 0% |
| Wednesday Night | 59°F | Clear | 5 to 8 mph WSW | 0% |
| Thursday | 93°F | Sunny | 5 to 8 mph WSW | 0% |
| Thursday Night | 60°F | Clear | 8 mph WSW | 0% |
| Friday | 98°F | Sunny | 5 to 8 mph WSW | 0% |
| Friday Night | 62°F | Clear | 8 mph SW | 0% |
| Saturday | 98°F | Sunny | 5 to 8 mph WSW | 0% |
| Saturday Night | 63°F | Mostly Clear | 8 mph SW | 0% |
| Sunday | 92°F | Sunny | 7 to 10 mph SW | 0% |
| Sunday Night | 60°F | Mostly Clear | 12 mph SW | 0% |
| Monday | 85°F | Sunny | 12 mph SW | 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 Aug 4, 2026.