Walnut Creek, CA Weather & Growing Conditions
Today
68°F
Sunny
Sunny. High near 68, with temperatures falling to around 65 in the afternoon. Northwest wind 2 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Sunny | 2 to 7 mph NW | 1% |
| Tonight | 47°F | Mostly Cloudy | 3 mph S | 1% |
| Thursday | 73°F | Patchy Fog then Sunny | 5 mph NNW | 0% |
| Thursday Night | 48°F | Mostly Clear | 2 mph SW | 0% |
| Friday | 73°F | Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 48°F | Clear | 0 mph | 0% |
| Saturday | 74°F | Sunny | 0 to 6 mph NNE | 0% |
| Saturday Night | 49°F | Mostly Clear | 0 mph | 0% |
| Sunday | 74°F | Sunny | 0 to 3 mph NNW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 0 mph | 0% |
| Monday | 73°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 49°F | Partly Cloudy | 1 mph SW | 1% |
| Tuesday | 74°F | Sunny | 0 to 3 mph NNW | 1% |
| Tuesday Night | 50°F | Partly Cloudy | 1 mph SW | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Walnut Creek, CA
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
Explore more for Walnut Creek, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.