Castella, CA Weather & Growing Conditions
Tonight
38°F
Partly Cloudy
Partly cloudy, with a low around 38. Northwest wind 1 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Partly Cloudy | 1 to 6 mph NW | 2% |
| Wednesday | 58°F | Mostly Sunny | 3 to 12 mph N | 1% |
| Wednesday Night | 40°F | Partly Cloudy | 3 to 13 mph NNW | 0% |
| Thursday | 61°F | Sunny | 0 to 3 mph N | 0% |
| Thursday Night | 44°F | Mostly Clear | 0 to 5 mph N | 0% |
| Friday | 68°F | Mostly Sunny | 1 mph NNE | 0% |
| Friday Night | 47°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 68°F | Sunny | 1 mph N | 0% |
| Saturday Night | 44°F | Partly Cloudy | 1 mph W | 0% |
| Sunday | 63°F | Mostly Sunny | 1 mph N | 1% |
| Sunday Night | 44°F | Mostly Cloudy | 0 mph | 2% |
| Monday | 61°F | Partly Sunny | 0 mph | 11% |
| Monday Night | 45°F | Partly Cloudy | 0 mph | 14% |
| Tuesday | 62°F | Slight Chance Light Rain | 1 mph E | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castella, CA
Last spring frost
Apr 23
First fall frost
Oct 27
Growing season
185 days
Hardiness zone
8a
Explore more for Castella, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Dunsmuir Trtmt Pl, Ca (2.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.