Walnut Creek, CA Weather & Growing Conditions
Overnight
49°F
Mostly Clear
Mostly clear, with a low around 49. North northeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Clear | 6 mph NNE | 0% |
| Wednesday | 68°F | Sunny | 2 to 6 mph NNW | 2% |
| Wednesday Night | 49°F | Mostly Cloudy | 5 mph SW | 2% |
| Thursday | 72°F | Mostly Sunny | 3 mph NW | 0% |
| Thursday Night | 48°F | Mostly Clear | 2 mph WSW | 0% |
| Friday | 74°F | Sunny | 2 mph NNE | 0% |
| Friday Night | 49°F | Mostly Clear | 1 mph N | 0% |
| Saturday | 75°F | Sunny | 1 to 5 mph NE | 0% |
| Saturday Night | 50°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 73°F | Sunny | 3 mph NNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 2 mph WSW | 0% |
| Monday | 71°F | Mostly Sunny | 3 mph WSW | 2% |
| Monday Night | 50°F | Partly Cloudy | 2 mph WSW | 2% |
| Tuesday | 72°F | Sunny | 2 mph W | 5% |
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 Nov 4, 2026.