Antioch, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Antioch, a city in Contra Costa County, California.
Tonight
52°F
Chance Light Rain then Mostly Cloudy
A chance of rain before 10pm. Mostly cloudy, with a low around 52. North northeast wind around 2 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Antioch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Chance Light Rain then Mostly Cloudy | 2 mph NNE | 30% |
| Wednesday | 67°F | Sunny | 2 to 7 mph NW | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph WSW | 0% |
| Thursday | 70°F | Sunny | 2 to 6 mph NW | 0% |
| Thursday Night | 52°F | Mostly Clear | 3 mph W | 0% |
| Friday | 71°F | Sunny | 2 mph NW | 0% |
| Friday Night | 52°F | Clear | 1 mph NNW | 0% |
| Saturday | 72°F | Sunny | 0 to 3 mph NE | 0% |
| Saturday Night | 53°F | Mostly Clear | 1 mph W | 0% |
| Sunday | 72°F | Mostly Sunny | 3 mph WNW | 0% |
| Sunday Night | 54°F | Partly Cloudy | 1 mph WNW | 0% |
| Monday | 70°F | Partly Sunny | 3 mph WSW | 1% |
| Monday Night | 54°F | Partly Cloudy | 3 mph WSW | 1% |
| Tuesday | 71°F | Mostly Sunny | 2 mph W | 5% |
Forecast source: National Weather Service (api.weather.gov) for Antioch (37.978, -121.796). Updated through the day.
Growing snapshot for Antioch
Last spring frost
Jan 12
First fall frost
Dec 19
Growing season
343 days
Hardiness zone
9b
More local growing data for Antioch: nearby ZIP 94509 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Antioch Pumping Plt #3, Ca (3.3 mi from Antioch). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.