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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, 08-Nov-2026 12:26am PST

Castro Valley/Hayward
 
Today

Today: Partly Sunny
Partly Sunny
Monday

Monday: Partly Sunny
Partly Sunny
Tuesday

Tuesday: Sunny
Sunny
Veterans
Day
Veterans Day: Sunny
Sunny
Thursday

Thursday: Mostly Sunny
Mostly Sunny
Friday

Friday: Slight Chance Light Rain
Slight Chance Light Rain
Saturday

Saturday: Chance Light Rain
Chance Light Rain
 
Hi 73 °F Hi 74 °F Hi 76 °F Hi 77 °F Hi 73 °F Hi 70 °F Hi 69 °F  
 
Tonight

Tonight: Mostly Cloudy
Mostly Cloudy
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
Tuesday
Night
Tuesday Night: Mostly Clear
Mostly Clear
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
Thursday
Night
Thursday Night: Partly Cloudy then Slight Chance Light Rain
Partly Cloudy then Slight Chance Light Rain
Friday
Night
Friday Night: Slight Chance Light Rain
Slight Chance Light Rain
Saturday
Night
Saturday Night: Light Rain Likely
Light Rain Likely
 
Lo 53 °F Lo 53 °F Lo 53 °F Lo 53 °F Lo 55 °F Lo 54 °F Lo 54 °F  

Coastal Flood Advisory
 

Today
 
 Partly sunny. High near 73, with temperatures falling to around 68 in the afternoon. Southwest wind 0 to 5 mph.
Tonight
 
 Mostly cloudy, with a low around 53. East southeast wind around 1 mph.
Monday
 
 Partly sunny. High near 74, with temperatures falling to around 69 in the afternoon. North wind 1 to 6 mph.
Monday Night
 
 Mostly clear, with a low around 53. Northwest wind 1 to 5 mph.
Tuesday
 
 Sunny, with a high near 76. North wind 1 to 5 mph.
Tuesday Night
 
 Mostly clear, with a low around 53.
Veterans Day
 
 Sunny, with a high near 77.
Wednesday Night
 
 Mostly clear, with a low around 53.
Thursday
 
 Mostly sunny, with a high near 73.
Thursday Night
 
 A slight chance of rain after 4am. Partly cloudy, with a low around 55.
Friday
 
 A slight chance of rain. Mostly sunny, with a high near 70.
Friday Night
 
 A slight chance of rain. Partly cloudy, with a low around 54.
Saturday
 
 A chance of rain. Partly sunny, with a high near 69.
Saturday Night
 
 Rain likely. Mostly cloudy, with a low around 54.

 

Forecast from NOAA-NWS for Castro Valley, CA.

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