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National Weather Service Forecast for: Castro Valley, CA


Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: Fri, 29-May-2026 8:56pm PDT

Castro Valley/Hayward
 
  Saturday

Saturday: Mostly Sunny
Mostly Sunny
Sunday

Sunday: Sunny
Sunny
Monday

Monday: Sunny
Sunny
Tuesday

Tuesday: Mostly Sunny
Mostly Sunny
Wednesday

Wednesday: Sunny
Sunny
Thursday

Thursday: Sunny
Sunny
Friday

Friday: Mostly Sunny
Mostly Sunny
  Hi 71 °F Hi 80 °F Hi 81 °F Hi 77 °F Hi 79 °F Hi 77 °F Hi 73 °F
 
Tonight

Tonight: Mostly Cloudy
Mostly Cloudy
Saturday
Night
Saturday Night: Mostly Clear
Mostly Clear
Sunday
Night
Sunday Night: Mostly Clear
Mostly Clear
Monday
Night
Monday Night: Partly Cloudy
Partly Cloudy
Tuesday
Night
Tuesday Night: Partly Cloudy
Partly Cloudy
Wednesday
Night
Wednesday Night: Partly Cloudy
Partly Cloudy
Thursday
Night
Thursday Night: Mostly Clear
Mostly Clear
 
Lo 53 °F Lo 51 °F Lo 54 °F Lo 54 °F Lo 54 °F Lo 56 °F Lo 54 °F  

 

Tonight
 
 Mostly cloudy, with a low around 53. Southwest wind around 7 mph.
Saturday
 
 Mostly sunny. High near 71, with temperatures falling to around 69 in the afternoon. Southwest wind 5 to 9 mph.
Saturday Night
 
 Mostly clear, with a low around 51. South southwest wind 1 to 9 mph.
Sunday
 
 Sunny, with a high near 80. West southwest wind 1 to 9 mph.
Sunday Night
 
 Mostly clear, with a low around 54. West southwest wind 1 to 9 mph.
Monday
 
 Sunny, with a high near 81.
Monday Night
 
 Partly cloudy, with a low around 54.
Tuesday
 
 Mostly sunny, with a high near 77.
Tuesday Night
 
 Partly cloudy, with a low around 54.
Wednesday
 
 Sunny, with a high near 79.
Wednesday Night
 
 Partly cloudy, with a low around 56.
Thursday
 
 Sunny, with a high near 77.
Thursday Night
 
 Mostly clear, with a low around 54.
Friday
 
 Mostly sunny, with a high near 73.

 

Forecast from NOAA-NWS for Castro Valley, CA.

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