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National Weather Service Forecast for: Castro Valley, CA


Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: Sun, 29-Mar-2026 9:16pm PDT

Castro Valley/Hayward
 
  Monday

Monday: Partly Sunny
Partly Sunny
Tuesday

Tuesday: Chance Light Rain
Chance Light Rain
Wednesday

Wednesday: Chance Light Rain
Chance Light Rain
Thursday

Thursday: Slight Chance Light Rain then Mostly Sunny
Slight Chance Light Rain then Mostly Sunny
Friday

Friday: Sunny
Sunny
Saturday

Saturday: Sunny
Sunny
Sunday

Sunday: Sunny
Sunny
  Hi 78 °F Hi 71 °F Hi 70 °F Hi 66 °F Hi 74 °F Hi 80 °F Hi 82 °F
 
Tonight

Tonight: Partly Cloudy
Partly Cloudy
Monday
Night
Monday Night: Mostly Cloudy then Slight Chance Light Rain
Mostly Cloudy then Slight Chance Light Rain
Tuesday
Night
Tuesday Night: Chance Light Rain
Chance Light Rain
Wednesday
Night
Wednesday Night: Chance Light Rain
Chance Light Rain
Thursday
Night
Thursday Night: Mostly Clear
Mostly Clear
Friday
Night
Friday Night: Clear
Clear
Saturday
Night
Saturday Night: Clear
Clear
 
Lo 57 °F Lo 55 °F Lo 52 °F Lo 50 °F Lo 45 °F Lo 49 °F Lo 52 °F  

 

Tonight
 
 Partly cloudy. Low around 57, with temperatures rising to around 60 overnight. Southeast wind around 2 mph.
Monday
 
 Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. South southwest wind 2 to 8 mph.
Monday Night
 
 A slight chance of rain after 5am. Mostly cloudy. Low around 55, with temperatures rising to around 57 overnight. West southwest wind around 6 mph. Chance of precipitation is 20%.
Tuesday
 
 A chance of rain. Mostly cloudy, with a high near 71. South southwest wind 3 to 9 mph. Chance of precipitation is 40%.
Tuesday Night
 
 A chance of rain. Mostly cloudy, with a low around 52. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.
Wednesday
 
 A chance of rain. Partly sunny, with a high near 70. Chance of precipitation is 40%.
Wednesday Night
 
 A chance of rain. Mostly cloudy, with a low around 50.
Thursday
 
 A slight chance of rain before 11am. Mostly sunny, with a high near 66.
Thursday Night
 
 Mostly clear, with a low around 45.
Friday
 
 Sunny, with a high near 74.
Friday Night
 
 Clear, with a low around 49.
Saturday
 
 Sunny, with a high near 80.
Saturday Night
 
 Clear, with a low around 52.
Sunday
 
 Sunny, with a high near 82.

 

Forecast from NOAA-NWS for Castro Valley, CA.

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