Onyx, CA Weather & Growing Conditions
Today
71°F
Sunny
Sunny. High near 71, with temperatures falling to around 69 in the afternoon. East southeast wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Sunny | 5 to 10 mph ESE | 0% |
| Tonight | 57°F | Partly Cloudy | 5 mph NE | 0% |
| Sunday | 72°F | Mostly Sunny | 5 to 10 mph ESE | 0% |
| Sunday Night | 58°F | Partly Cloudy | 5 to 10 mph NW | 3% |
| Monday | 68°F | Partly Sunny | 5 to 10 mph SW | 7% |
| Monday Night | 54°F | Mostly Clear | 10 mph WNW | 7% |
| Tuesday | 69°F | Sunny | 5 to 10 mph SW | 1% |
| Tuesday Night | 57°F | Clear | 5 to 10 mph WNW | 1% |
| Wednesday | 73°F | Sunny | 5 to 15 mph ENE | 0% |
| Wednesday Night | 60°F | Clear | 5 to 15 mph NW | 0% |
| Thursday | 74°F | Sunny | 5 to 15 mph E | 1% |
| Thursday Night | 59°F | Mostly Clear | 5 to 15 mph W | 1% |
| Friday | 74°F | Sunny | 5 to 20 mph SW | 2% |
| Friday Night | 57°F | Mostly Clear | 5 to 20 mph W | 2% |
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 Sep 19, 2026.