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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

WhenTempForecastWindPrecip
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.