Hercules, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hercules, a city in Contra Costa County, California.
Overnight
57°F
Partly Cloudy
Partly cloudy. Low around 57, with temperatures rising to around 59 overnight. Southwest wind around 9 mph.
7-day forecast for Hercules
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Partly Cloudy | 9 mph SW | 0% |
| Tuesday | 75°F | Haze then Sunny | 8 to 14 mph SSW | 0% |
| Tuesday Night | 57°F | Partly Cloudy | 8 to 13 mph SW | 0% |
| Wednesday | 71°F | Mostly Sunny | 8 to 13 mph SW | 0% |
| Wednesday Night | 57°F | Mostly Clear | 7 to 13 mph SW | 0% |
| Thursday | 70°F | Sunny | 7 to 12 mph SW | 0% |
| Thursday Night | 58°F | Mostly Clear | 7 to 12 mph SW | 0% |
| Friday | 76°F | Sunny | 6 to 10 mph SW | 0% |
| Friday Night | 59°F | Mostly Clear | 7 to 12 mph SW | 0% |
| Saturday | 78°F | Sunny | 6 to 12 mph SW | 0% |
| Saturday Night | 60°F | Mostly Clear | 12 mph SSW | 0% |
| Sunday | 76°F | Sunny | 9 to 13 mph SSW | 0% |
| Sunday Night | 58°F | Mostly Clear | 14 mph SSW | 0% |
| Monday | 70°F | Sunny | 14 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Hercules (38.021, -122.289). Updated through the day.
Growing snapshot for Hercules
Last spring frost
Jan 4
First fall frost
Jan 2
Growing season
365 days
Hardiness zone
9b
More local growing data for Hercules: nearby ZIP 94564 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Acalanes Ridge
Alamo
Alhambra Valley
Antioch
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
Knightsen
Lafayette
Martinez
Montalvin Manor
Moraga
Mountain View
Norris Canyon
Climate data from the nearest NOAA station, Richmond, Ca (7.5 mi from Hercules). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.