National Weather Service Forecast for: Hercules CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:07 am PDT Sep 13, 2026
 
Overnight

Overnight: Clear, with a low around 56. West wind around 10 mph, with gusts as high as 20 mph.
Clear
 Sunday

Sunday: Sunny, with a high near 74. West wind 9 to 13 mph, with gusts as high as 20 mph.
Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 54. Southwest wind 5 to 8 mph.
Mostly Clear
 Monday

Monday: Sunny, with a high near 80. Southwest wind 5 to 10 mph.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 56. South southwest wind 7 to 9 mph.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 76.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 56.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 74.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 56.
Mostly Clear
Lo 56 °F Hi 74 °F Lo 54 °F Hi 80 °F Lo 56 °F Hi 76 °F Lo 56 °F Hi 74 °F Lo 56 °F

 

Overnight
 
 Clear, with a low around 56. West wind around 10 mph, with gusts as high as 20 mph.
Sunday
 
 Sunny, with a high near 74. West wind 9 to 13 mph, with gusts as high as 20 mph.
Sunday Night
 
 Mostly clear, with a low around 54. Southwest wind 5 to 8 mph.
Monday
 
 Sunny, with a high near 80. Southwest wind 5 to 10 mph.
Monday Night
 
 Mostly clear, with a low around 56. South southwest wind 7 to 9 mph.
Tuesday
 
 Sunny, with a high near 76.
Tuesday Night
 
 Mostly clear, with a low around 56.
Wednesday
 
 Sunny, with a high near 74.
Wednesday Night
 
 Mostly clear, with a low around 56.
Thursday
 
 Mostly sunny, with a high near 76.
Thursday Night
 
 Mostly clear, with a low around 56.
Friday
 
 Sunny, with a high near 77.
Friday Night
 
 Mostly clear, with a low around 56.
Saturday
 
 Mostly sunny, with a high near 76.

 

Forecast from NOAA-NWS for Hercules CA.