Walnut Creek, CA Weather & Growing Conditions
Tonight
57°F
Mostly Clear
Mostly clear. Low around 57, with temperatures rising to around 59 overnight. South southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Clear | 7 mph SSW | 0% |
| Saturday | 90°F | Sunny | 5 to 8 mph SW | 0% |
| Saturday Night | 57°F | Partly Cloudy | 7 mph SSW | 0% |
| Sunday | 80°F | Mostly Cloudy | 8 mph SW | 3% |
| Sunday Night | 57°F | Mostly Cloudy | 8 mph SW | 3% |
| Monday | 82°F | Sunny | 9 mph WSW | 0% |
| Monday Night | 56°F | Mostly Clear | 6 to 9 mph SW | 0% |
| Tuesday | 85°F | Sunny | 8 mph WSW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Wednesday | 96°F | Sunny | 5 mph W | 0% |
| Wednesday Night | 61°F | Mostly Clear | 5 mph WSW | 0% |
| Thursday | 97°F | Sunny | 2 to 7 mph W | 0% |
| Thursday Night | 61°F | Mostly Clear | 7 mph WSW | 0% |
| Friday | 89°F | Sunny | 8 mph SW | 0% |
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 Sep 19, 2026.