Antioch, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Antioch, a city in Contra Costa County, California.
Overnight
66°F
Clear
Clear, with a low around 66. West northwest wind around 5 mph.
7-day forecast for Antioch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Clear | 5 mph WNW | 0% |
| Tuesday | 100°F | Sunny | 6 to 13 mph WNW | 0% |
| Tuesday Night | 65°F | Clear | 5 to 12 mph WNW | 0% |
| Wednesday | 97°F | Sunny | 6 to 12 mph W | 0% |
| Wednesday Night | 64°F | Clear | 6 to 12 mph W | 0% |
| Thursday | 95°F | Sunny | 5 to 13 mph W | 0% |
| Thursday Night | 66°F | Clear | 5 to 13 mph WSW | 0% |
| Friday | 100°F | Sunny | 5 to 13 mph W | 0% |
| Friday Night | 69°F | Clear | 5 to 13 mph WSW | 0% |
| Saturday | 99°F | Sunny | 5 to 13 mph W | 0% |
| Saturday Night | 70°F | Mostly Clear | 5 to 13 mph WSW | 0% |
| Sunday | 95°F | Sunny | 5 to 14 mph WSW | 0% |
| Sunday Night | 66°F | Mostly Clear | 7 to 14 mph WSW | 0% |
| Monday | 90°F | Sunny | 6 to 14 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 Aug 4, 2026.