Walnut Creek, CA Weather & Growing Conditions
Today
100°F
Sunny
Sunny. High near 100, with temperatures falling to around 96 in the afternoon. Southwest wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 5 to 8 mph SW | 0% |
| Tonight | 58°F | Clear | 5 to 8 mph SW | 0% |
| Wednesday | 94°F | Sunny | 5 to 8 mph SW | 0% |
| Wednesday Night | 59°F | Clear | 5 to 8 mph WSW | 0% |
| Thursday | 91°F | Sunny | 3 to 8 mph WSW | 0% |
| Thursday Night | 60°F | Clear | 5 to 8 mph WSW | 0% |
| Friday | 96°F | Sunny | 3 to 8 mph WSW | 0% |
| Friday Night | 62°F | Clear | 5 to 8 mph SW | 0% |
| Saturday | 96°F | Sunny | 3 to 8 mph WSW | 0% |
| Saturday Night | 63°F | Mostly Clear | 8 mph SW | 0% |
| Sunday | 90°F | Sunny | 6 to 10 mph SW | 0% |
| Sunday Night | 59°F | Mostly Clear | 10 mph SW | 0% |
| Monday | 84°F | Sunny | 8 to 12 mph SW | 0% |
| Monday Night | 58°F | Mostly Clear | 7 to 12 mph WSW | 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 (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.