Antioch, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Antioch, a city in Contra Costa County, California.
This Afternoon
85°F
Sunny
Sunny, with a high near 85. West wind around 10 mph, with gusts as high as 18 mph.
7-day forecast for Antioch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Sunny | 10 mph W | 0% |
| Tonight | 61°F | Clear | 2 to 10 mph W | 0% |
| Saturday | 89°F | Sunny | 2 to 9 mph W | 0% |
| Saturday Night | 62°F | Mostly Cloudy | 2 to 8 mph WSW | 0% |
| Sunday | 82°F | Partly Sunny | 3 to 10 mph WSW | 0% |
| Sunday Night | 61°F | Mostly Cloudy | 6 to 10 mph WSW | 0% |
| Monday | 84°F | Sunny | 6 to 10 mph WSW | 0% |
| Monday Night | 61°F | Mostly Clear | 3 to 10 mph WSW | 0% |
| Tuesday | 88°F | Sunny | 3 to 9 mph W | 0% |
| Tuesday Night | 62°F | Mostly Clear | 0 to 9 mph SW | 0% |
| Wednesday | 96°F | Sunny | 0 to 5 mph WNW | 0% |
| Wednesday Night | 67°F | Mostly Clear | 0 to 5 mph WSW | 0% |
| Thursday | 96°F | Sunny | 0 to 9 mph W | 0% |
| Thursday Night | 68°F | Mostly Clear | 3 to 9 mph WSW | 0% |
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 Sep 19, 2026.