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
70°F
Sunny
Sunny, with a high near 70. Southwest wind 8 to 12 mph.
7-day forecast for Hercules
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Sunny | 8 to 12 mph SW | 0% |
| Tonight | 58°F | Mostly Clear | 7 to 10 mph SW | 0% |
| Saturday | 71°F | Sunny | 7 to 10 mph SSW | 0% |
| Saturday Night | 59°F | Partly Cloudy | 9 mph SSW | 0% |
| Sunday | 64°F | Partly Sunny | 10 mph SW | 1% |
| Sunday Night | 58°F | Mostly Cloudy | 10 mph SW | 1% |
| Monday | 66°F | Mostly Sunny | 9 to 13 mph SW | 0% |
| Monday Night | 58°F | Partly Cloudy | 8 to 13 mph SW | 0% |
| Tuesday | 72°F | Sunny | 7 to 12 mph SW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 3 to 12 mph SSW | 0% |
| Wednesday | 82°F | Sunny | 2 to 7 mph SW | 0% |
| Wednesday Night | 60°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Thursday | 82°F | Sunny | 2 to 9 mph SW | 0% |
| Thursday Night | 61°F | Partly Cloudy | 6 to 9 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
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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 Sep 19, 2026.