Walnut Creek, CA Weather & Growing Conditions
Overnight
47°F
Mostly Clear
Mostly clear. Low around 47, with temperatures rising to around 49 overnight. East northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Mostly Clear | 5 mph ENE | 0% |
| Wednesday | 68°F | Sunny | 2 to 7 mph N | 2% |
| Wednesday Night | 48°F | Mostly Cloudy | 5 mph SSW | 2% |
| Thursday | 73°F | Patchy Fog then Mostly Sunny | 0 to 5 mph WNW | 0% |
| Thursday Night | 48°F | Clear | 2 mph WSW | 0% |
| Friday | 74°F | Sunny | 0 to 5 mph NNE | 0% |
| Friday Night | 48°F | Mostly Clear | 0 mph | 0% |
| Saturday | 75°F | Sunny | 0 to 5 mph NE | 0% |
| Saturday Night | 49°F | Mostly Clear | 0 mph | 0% |
| Sunday | 74°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 50°F | Partly Cloudy | 1 mph WNW | 0% |
| Monday | 71°F | Mostly Sunny | 1 to 5 mph WSW | 1% |
| Monday Night | 49°F | Partly Cloudy | 2 mph SW | 1% |
| Tuesday | 72°F | Sunny | 0 to 3 mph NW | 5% |
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.