Onyx, CA Weather & Growing Conditions
Today
51°F
Sunny
Sunny. High near 51, with temperatures falling to around 47 in the afternoon. South southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 51°F | Sunny | 5 mph SSW | 0% |
| Tonight | 41°F | Partly Cloudy | 5 mph NE | 0% |
| Thursday | 54°F | Partly Sunny | 5 mph E | 0% |
| Thursday Night | 43°F | Mostly Clear | 5 mph NE | 0% |
| Friday | 57°F | Sunny | 5 to 10 mph NE | 0% |
| Friday Night | 44°F | Clear | 5 to 10 mph NE | 0% |
| Saturday | 58°F | Sunny | 5 to 10 mph ENE | 0% |
| Saturday Night | 46°F | Mostly Clear | 5 mph NNE | 0% |
| Sunday | 58°F | Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 46°F | Mostly Clear | 5 to 10 mph NNE | 0% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph SSE | 0% |
| Monday Night | 45°F | Partly Cloudy | 5 to 10 mph W | 0% |
| Tuesday | 57°F | Sunny | 0 to 10 mph S | 1% |
| Tuesday Night | 45°F | Mostly Clear | 5 to 10 mph WSW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onyx, CA
Last spring frost
Apr 5
First fall frost
Nov 3
Growing season
212 days
Hardiness zone
9a
Explore more for Onyx, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, S Lake Fs, Ca (14.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.