National Weather Service Forecast for: Castro Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Apr 13, 2025
 
Overnight

Overnight: Clear, with a low around 53. Calm wind.
Clear
 Monday

Monday: Sunny, with a high near 82. Calm wind becoming west 5 to 8 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 52. West southwest wind around 6 mph.
Partly Cloudy
 Tuesday

Tuesday: Partly sunny, with a high near 73. West wind 5 to 10 mph.
Partly Sunny
 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 53. West wind 6 to 11 mph, with gusts as high as 18 mph.
Mostly Cloudy
 Wednesday

Wednesday: Partly sunny, with a high near 69.
Partly Sunny
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 52.
Partly Cloudy
 Thursday

Thursday: Mostly sunny, with a high near 67.
Mostly Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 49.
Partly Cloudy
Lo 53 °F Hi 82 °F Lo 52 °F Hi 73 °F Lo 53 °F Hi 69 °F Lo 52 °F Hi 67 °F Lo 49 °F

 

Overnight
 
 Clear, with a low around 53. Calm wind.
Monday
 
 Sunny, with a high near 82. Calm wind becoming west 5 to 8 mph in the afternoon.
Monday Night
 
 Partly cloudy, with a low around 52. West southwest wind around 6 mph.
Tuesday
 
 Partly sunny, with a high near 73. West wind 5 to 10 mph.
Tuesday Night
 
 Mostly cloudy, with a low around 53. West wind 6 to 11 mph, with gusts as high as 18 mph.
Wednesday
 
 Partly sunny, with a high near 69.
Wednesday Night
 
 Partly cloudy, with a low around 52.
Thursday
 
 Mostly sunny, with a high near 67.
Thursday Night
 
 Partly cloudy, with a low around 49.
Friday
 
 Sunny, with a high near 75.
Friday Night
 
 Mostly clear, with a low around 50.
Saturday
 
 Sunny, with a high near 75.
Saturday Night
 
 Mostly clear, with a low around 50.
Sunday
 
 Sunny, with a high near 70.

 

Forecast from NOAA-NWS for Castro Valley CA.