National Weather Service Forecast for: Hercules CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 10:26 pm PST Nov 1, 2026
 
Tonight

Tonight: Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 48. Calm wind.
Mostly Clear
then Patchy
Fog
 Monday

Monday: Mostly cloudy, with a high near 64. Light and variable wind.
Mostly Cloudy

 Monday
Night
Monday Night: Cloudy during the early evening, then gradual clearing, with a low around 50. Calm wind.
Gradual
Clearing
 Tuesday

Tuesday: Rain. High near 61. South wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Rain

 Tuesday
Night
Tuesday Night: A 40 percent chance of rain, mainly before 10pm. Partly cloudy, with a low around 49. Northeast wind around 5 mph.
Chance Rain

 Wednesday

Wednesday: Mostly sunny, with a high near 66.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Thursday

Thursday: Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 69.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 50.
Mostly Clear
Lo 48 °F Hi 64 °F Lo 50 °F Hi 61 °F Lo 49 °F Hi 66 °F Lo 50 °F Hi 69 °F Lo 50 °F

 

Tonight
 
 Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 48. Calm wind.
Monday
 
 Mostly cloudy, with a high near 64. Light and variable wind.
Monday Night
 
 Cloudy during the early evening, then gradual clearing, with a low around 50. Calm wind.
Tuesday
 
 Rain. High near 61. South wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 A 40 percent chance of rain, mainly before 10pm. Partly cloudy, with a low around 49. Northeast wind around 5 mph.
Wednesday
 
 Mostly sunny, with a high near 66.
Wednesday Night
 
 Partly cloudy, with a low around 50.
Thursday
 
 Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 69.
Thursday Night
 
 Mostly clear, with a low around 50.
Friday
 
 Sunny, with a high near 71.
Friday Night
 
 Mostly clear, with a low around 50.
Saturday
 
 Sunny, with a high near 72.
Saturday Night
 
 Mostly clear, with a low around 50.
Sunday
 
 Mostly sunny, with a high near 71.

 

Forecast from NOAA-NWS for Hercules CA.