Hercules, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hercules, a city in Contra Costa County, California.
Tonight
53°F
Partly Cloudy
Partly cloudy, with a low around 53. East wind 6 to 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hercules
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Partly Cloudy | 6 to 10 mph E | 14% |
| Wednesday | 63°F | Sunny | 3 to 9 mph NNW | 2% |
| Wednesday Night | 53°F | Mostly Cloudy | 3 to 8 mph WNW | 2% |
| Thursday | 65°F | Mostly Sunny | 3 mph WNW | 0% |
| Thursday Night | 54°F | Mostly Clear | 2 mph W | 0% |
| Friday | 65°F | Mostly Sunny | 2 mph NNE | 0% |
| Friday Night | 54°F | Mostly Clear | 2 mph NE | 0% |
| Saturday | 66°F | Sunny | 0 to 8 mph E | 0% |
| Saturday Night | 54°F | Mostly Clear | 2 mph W | 0% |
| Sunday | 66°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 0 to 3 mph WSW | 0% |
| Monday | 65°F | Mostly Sunny | 3 mph W | 2% |
| Monday Night | 55°F | Partly Cloudy | 2 mph W | 2% |
| Tuesday | 65°F | Sunny | 2 mph WNW | 6% |
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
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Contra Costa Centre
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East Richmond Heights
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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 4, 2026.