National Weather Service Forecast for: Castro Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Jul 4, 2025
 
Tonight

Tonight: Increasing clouds, with a low around 53. West southwest wind 6 to 11 mph.
Increasing
Clouds
Saturday

Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 68. West wind 7 to 11 mph.
Decreasing
Clouds
Saturday
Night
Saturday Night: Increasing clouds, with a low around 53. West southwest wind 6 to 9 mph.
Increasing
Clouds
Sunday

Sunday: Mostly cloudy through mid morning, then gradual clearing, with a high near 74. West southwest wind 5 to 10 mph.
Becoming
Sunny
Sunday
Night
Sunday Night: Partly cloudy, with a low around 54. West northwest wind 5 to 10 mph.
Partly Cloudy
Monday

Monday: Mostly sunny, with a high near 75.
Mostly Sunny
Monday
Night
Monday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Tuesday

Tuesday: Mostly sunny, with a high near 74.
Mostly Sunny
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 56.
Partly Cloudy
Lo 53 °F Hi 68 °F Lo 53 °F Hi 74 °F Lo 54 °F Hi 75 °F Lo 56 °F Hi 74 °F Lo 56 °F

 

Tonight
 
Increasing clouds, with a low around 53. West southwest wind 6 to 11 mph.
Saturday
 
Mostly cloudy, then gradually becoming sunny, with a high near 68. West wind 7 to 11 mph.
Saturday Night
 
Increasing clouds, with a low around 53. West southwest wind 6 to 9 mph.
Sunday
 
Mostly cloudy through mid morning, then gradual clearing, with a high near 74. West southwest wind 5 to 10 mph.
Sunday Night
 
Partly cloudy, with a low around 54. West northwest wind 5 to 10 mph.
Monday
 
Mostly sunny, with a high near 75.
Monday Night
 
Partly cloudy, with a low around 56.
Tuesday
 
Mostly sunny, with a high near 74.
Tuesday Night
 
Partly cloudy, with a low around 56.
Wednesday
 
Mostly sunny, with a high near 79.
Wednesday Night
 
Mostly clear, with a low around 56.
Thursday
 
Sunny, with a high near 84.
Thursday Night
 
Mostly clear, with a low around 57.
Friday
 
Sunny, with a high near 81.

 

Forecast from NOAA-NWS for Castro Valley CA.