Hercules, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hercules, a city in Contra Costa County, California.
This Afternoon
63°F
Mostly Sunny
Mostly sunny, with a high near 63. West wind around 9 mph.
7-day forecast for Hercules
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Mostly Sunny | 9 mph W | 1% |
| Tonight | 53°F | Mostly Cloudy | 3 to 8 mph W | 1% |
| Thursday | 65°F | Patchy Fog then Sunny | 3 mph WSW | 0% |
| Thursday Night | 54°F | Mostly Clear | 3 mph W | 0% |
| Friday | 65°F | Mostly Sunny | 2 mph N | 0% |
| Friday Night | 54°F | Mostly Clear | 2 mph NNW | 0% |
| Saturday | 68°F | Sunny | 0 to 8 mph NE | 0% |
| Saturday Night | 52°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 68°F | Mostly Sunny | 0 to 3 mph NW | 0% |
| Sunday Night | 53°F | Partly Cloudy | 2 mph WSW | 0% |
| Monday | 67°F | Mostly Sunny | 3 mph W | 0% |
| Monday Night | 53°F | Partly Cloudy | 2 mph W | 1% |
| Tuesday | 68°F | Patchy Fog then Mostly Sunny | 2 mph WNW | 1% |
| Tuesday Night | 54°F | Partly Cloudy | 0 to 3 mph WSW | 9% |
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
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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 Nov 5, 2026.