Clayton, CA Weather & Growing Conditions
Tonight
59°F
Partly Cloudy
Partly cloudy. Low around 59, with temperatures rising to around 61 overnight. West southwest wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Partly Cloudy | 9 mph WSW | 0% |
| Sunday | 71°F | Partly Sunny | 3 to 8 mph SW | 0% |
| Sunday Night | 59°F | Mostly Cloudy | 8 to 13 mph SW | 0% |
| Monday | 73°F | Sunny | 7 to 12 mph WSW | 0% |
| Monday Night | 58°F | Mostly Clear | 8 to 13 mph WSW | 0% |
| Tuesday | 75°F | Sunny | 2 to 8 mph WSW | 0% |
| Tuesday Night | 59°F | Mostly Clear | 2 to 8 mph WSW | 0% |
| Wednesday | 85°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 68°F | Mostly Clear | 0 to 5 mph WSW | 0% |
| Thursday | 88°F | Sunny | 0 to 7 mph WNW | 0% |
| Thursday Night | 68°F | Mostly Clear | 7 mph WSW | 0% |
| Friday | 81°F | Sunny | 3 to 9 mph WSW | 0% |
| Friday Night | 63°F | Mostly Clear | 9 mph WSW | 0% |
| Saturday | 74°F | Sunny | 5 to 9 mph WSW | 0% |
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 Sep 20, 2026.