Castella, CA Weather & Growing Conditions
This Afternoon
48°F
Chance Light Rain
A chance of rain before 4pm. Mostly cloudy. High near 48, with temperatures falling to around 45 in the afternoon. Southwest wind 0 to 3 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 48°F | Chance Light Rain | 0 to 3 mph SW | 32% |
| 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% |
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.