Walnut Creek, CA Weather & Growing Conditions
Today
88°F
Sunny
Sunny. High near 88, with temperatures falling to around 83 in the afternoon. West southwest wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 5 to 8 mph WSW | 0% |
| Tonight | 58°F | Partly Cloudy | 8 mph SSW | 0% |
| Sunday | 77°F | Mostly Cloudy | 8 mph SSW | 0% |
| Sunday Night | 57°F | Mostly Cloudy | 9 mph SW | 0% |
| Monday | 78°F | Mostly Sunny | 10 mph SW | 0% |
| Monday Night | 57°F | Partly Cloudy | 10 mph SW | 0% |
| Tuesday | 80°F | Sunny | 5 to 8 mph WSW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 3 to 8 mph SW | 0% |
| Wednesday | 94°F | Sunny | 1 to 5 mph W | 0% |
| Wednesday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Thursday | 96°F | Sunny | 1 to 6 mph W | 0% |
| Thursday Night | 62°F | Mostly Clear | 6 mph WSW | 0% |
| Friday | 88°F | Sunny | 8 mph SW | 0% |
| Friday Night | 59°F | Mostly Clear | 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
Jan 7
First fall frost
Dec 19
Growing season
346 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, Concord Wwtp, Ca (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.