Clayton, CA Weather & Growing Conditions
Today
59°F
Sunny
Sunny. High near 59, with temperatures falling to around 55 in the afternoon. Northwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Sunny | 7 mph NW | 1% |
| Tonight | 47°F | Mostly Cloudy | 6 mph WNW | 1% |
| Thursday | 63°F | Sunny | 2 to 6 mph NW | 0% |
| Thursday Night | 48°F | Mostly Clear | 3 mph W | 0% |
| Friday | 63°F | Sunny | 5 mph N | 0% |
| Friday Night | 49°F | Clear | 2 mph N | 0% |
| Saturday | 65°F | Sunny | 0 to 3 mph NE | 0% |
| Saturday Night | 51°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 65°F | Sunny | 3 mph NW | 0% |
| Sunday Night | 53°F | Partly Cloudy | 2 mph NW | 0% |
| Monday | 63°F | Mostly Sunny | 1 to 5 mph WSW | 0% |
| Monday Night | 52°F | Partly Cloudy | 3 mph WSW | 1% |
| Tuesday | 64°F | Sunny | 2 mph WNW | 1% |
| Tuesday Night | 54°F | Partly Cloudy | 2 mph WSW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Clayton, CA
Last spring frost
Mar 8
First fall frost
Dec 22
Growing season
282 days
Hardiness zone
9b
Explore more for Clayton, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Mt Diablo Junction, Ca (2.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.