Clayton, CA Weather & Growing Conditions
Overnight
69°F
Clear
Clear. Low around 69, with temperatures rising to around 73 overnight. Southwest wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Clear | 9 mph SW | 0% |
| Tuesday | 96°F | Sunny | 5 to 10 mph SW | 0% |
| Tuesday Night | 69°F | Clear | 8 to 12 mph WSW | 0% |
| Wednesday | 91°F | Sunny | 6 to 10 mph WSW | 0% |
| Wednesday Night | 68°F | Clear | 12 mph WSW | 0% |
| Thursday | 89°F | Sunny | 5 to 10 mph WSW | 0% |
| Thursday Night | 70°F | Clear | 12 mph WSW | 0% |
| Friday | 93°F | Sunny | 5 to 10 mph WSW | 0% |
| Friday Night | 73°F | Clear | 8 to 12 mph WSW | 0% |
| Saturday | 93°F | Sunny | 5 to 10 mph WSW | 0% |
| Saturday Night | 74°F | Mostly Clear | 12 mph WSW | 0% |
| Sunday | 88°F | Sunny | 7 to 12 mph SW | 0% |
| Sunday Night | 69°F | Mostly Clear | 12 to 15 mph SW | 0% |
| Monday | 82°F | Sunny | 8 to 14 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 Aug 4, 2026.