National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
||||||||||||||||||||||||||||||||||||||||
| Updated: Tue, 18-Aug-2026 1:26pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||
| This Afternoon |
Mostly sunny. High near 78, with temperatures falling to around 75 in the afternoon. West wind around 8 mph. |
| Tonight |
Mostly cloudy, with a low around 59. West southwest wind 2 to 7 mph. |
| Wednesday |
Mostly sunny. High near 78, with temperatures falling to around 75 in the afternoon. West southwest wind 2 to 9 mph. |
| Wednesday Night |
Partly cloudy, with a low around 59. West southwest wind 5 to 8 mph. |
| Thursday |
Partly sunny, with a high near 74. West southwest wind 5 to 9 mph. |
| Thursday Night |
Mostly cloudy, with a low around 59. |
| Friday |
Partly sunny, with a high near 73. |
| Friday Night |
Mostly cloudy, with a low around 58. |
| Saturday |
Mostly sunny, with a high near 74. |
| Saturday Night |
Partly cloudy, with a low around 58. |
| Sunday |
Mostly sunny, with a high near 76. |
| Sunday Night |
Partly cloudy, with a low around 59. |
| Monday |
Mostly sunny, with a high near 73. |
| Monday Night |
Mostly cloudy, with a low around 58. |
Forecast from NOAA-NWS for Castro Valley, CA.
Alerts
