Onyx, CA Weather & Growing Conditions
Today
87°F
Sunny
Sunny. High near 87, with temperatures falling to around 85 in the afternoon. West wind 5 to 20 mph, with gusts as high as 35 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 to 20 mph W | 0% |
| Tonight | 66°F | Clear | 10 to 20 mph W | 0% |
| Wednesday | 87°F | Sunny | 10 to 25 mph W | 0% |
| Wednesday Night | 66°F | Clear | 10 to 25 mph W | 0% |
| Thursday | 87°F | Sunny | 5 to 15 mph WSW | 0% |
| Thursday Night | 67°F | Clear | 10 to 15 mph W | 0% |
| Friday | 88°F | Sunny | 5 to 15 mph WSW | 0% |
| Friday Night | 67°F | Clear | 10 to 15 mph W | 0% |
| Saturday | 88°F | Sunny | 5 to 20 mph W | 1% |
| Saturday Night | 67°F | Mostly Clear | 10 to 20 mph W | 1% |
| Sunday | 87°F | Sunny | 10 to 25 mph WSW | 1% |
| Sunday Night | 66°F | Mostly Clear | 10 to 25 mph W | 1% |
| Monday | 83°F | Sunny | 10 to 30 mph WSW | 4% |
| Monday Night | 63°F | Mostly Clear | 10 to 30 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 Aug 4, 2026.