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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, 19-Jun-2026 1:26am PDT

Castro Valley/Hayward
 
  Juneteenth

Juneteenth: Slight Chance Drizzle then Mostly Sunny
Slight Chance Drizzle then Mostly Sunny
Saturday

Saturday: Slight Chance Drizzle then Mostly Sunny
Slight Chance Drizzle then Mostly Sunny
Sunday

Sunday: Mostly Sunny
Mostly Sunny
Monday

Monday: Mostly Sunny
Mostly Sunny
Tuesday

Tuesday: Mostly Sunny
Mostly Sunny
Wednesday

Wednesday: Sunny
Sunny
Thursday

Thursday: Sunny
Sunny
  Hi 73 °F Hi 72 °F Hi 73 °F Hi 77 °F Hi 79 °F Hi 80 °F Hi 79 °F
 
Overnight

Overnight: Slight Chance Drizzle
Slight Chance Drizzle
Friday
Night
Friday Night: Slight Chance Drizzle
Slight Chance Drizzle
Saturday
Night
Saturday Night: Partly Cloudy
Partly Cloudy
Sunday
Night
Sunday Night: Partly Cloudy
Partly Cloudy
Monday
Night
Monday Night: Partly Cloudy
Partly Cloudy
Tuesday
Night
Tuesday Night: Partly Cloudy then Patchy Fog
Partly Cloudy then Patchy Fog
Wednesday
Night
Wednesday Night: Partly Cloudy
Partly Cloudy
 
Lo 58 °F Lo 57 °F Lo 55 °F Lo 56 °F Lo 56 °F Lo 57 °F Lo 57 °F  

 

Overnight
 
 A slight chance of drizzle. Mostly cloudy, with a low around 58. West southwest wind around 6 mph.
Juneteenth
 
 A slight chance of drizzle before 11am. Mostly sunny. High near 73, with temperatures falling to around 71 in the afternoon. Southwest wind 5 to 12 mph, with gusts as high as 18 mph.
Friday Night
 
 A slight chance of drizzle after 11pm. Mostly cloudy, with a low around 57. West wind 2 to 13 mph, with gusts as high as 21 mph.
Saturday
 
 A slight chance of drizzle before 11am. Mostly sunny, with a high near 72. West wind 2 to 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 55. West southwest wind 3 to 10 mph.
Sunday
 
 Mostly sunny, with a high near 73.
Sunday Night
 
 Partly cloudy, with a low around 56.
Monday
 
 Mostly sunny, with a high near 77.
Monday Night
 
 Partly cloudy, with a low around 56.
Tuesday
 
 Mostly sunny, with a high near 79.
Tuesday Night
 
 Patchy fog after 5am. Partly cloudy, with a low around 57.
Wednesday
 
 Sunny, with a high near 80.
Wednesday Night
 
 Partly cloudy, with a low around 57.
Thursday
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for Castro Valley, CA.

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