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
61°F
Light Rain Likely
Rain likely. Partly sunny. High near 61, with temperatures falling to around 57 in the afternoon. South southeast wind 2 to 7 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Antioch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Light Rain Likely | 2 to 7 mph SSE | 65% |
| 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% |
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
Nearby towns & communities
Acalanes Ridge
Alamo
Alhambra Valley
Bay Point
Bayview
Benicia
Bethel Island
Blackhawk
Brentwood
Byron
Castle Hill
Clayton
Clyde
Concord
Contra Costa Centre
Crockett
Danville
Diablo
Discovery Bay
East Richmond Heights
El Cerrito
El Sobrante
Hercules
Knightsen
Lafayette
Martinez
Montalvin Manor
Moraga
Mountain View
Norris Canyon
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 3, 2026.