Castella, CA Weather & Growing Conditions
Today
56°F
Partly Sunny
Partly sunny. High near 56, with temperatures falling to around 54 in the afternoon. North wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 56°F | Partly Sunny | 1 mph N | 5% |
| Tonight | 38°F | Mostly Clear | 2 to 8 mph N | 3% |
| Thursday | 60°F | Sunny | 2 to 9 mph NNE | 0% |
| Thursday Night | 41°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Friday | 66°F | Mostly Sunny | 0 to 7 mph N | 0% |
| Friday Night | 45°F | Mostly Clear | 0 to 7 mph N | 0% |
| Saturday | 65°F | Sunny | 0 to 5 mph E | 0% |
| Saturday Night | 41°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 42°F | Mostly Cloudy | 2 mph N | 0% |
| Monday | 60°F | Mostly Sunny | 2 mph N | 1% |
| Monday Night | 42°F | Partly Cloudy | 0 to 3 mph N | 5% |
| Tuesday | 60°F | Mostly Sunny | 0 to 3 mph N | 14% |
| Tuesday Night | 42°F | Slight Chance Light Rain | 2 mph N | 22% |
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
8b
Explore more for Castella, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Dunsmuir Trtmt Pl, Ca (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.