National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Tue, 22-Sep-2026 1:26pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy, with a low around 57. South wind 1 to 5 mph. |
| Wednesday |
Sunny. High near 86, with temperatures falling to around 83 in the afternoon. West wind 0 to 7 mph. |
| Wednesday Night |
Partly cloudy, with a low around 60. West southwest wind 0 to 5 mph. |
| Thursday |
Mostly sunny, with a high near 83. West southwest wind 1 to 8 mph. |
| Thursday Night |
Mostly cloudy, with a low around 60. West southwest wind 3 to 8 mph. |
| Friday |
Mostly sunny, with a high near 74. |
| Friday Night |
Partly cloudy, with a low around 54. |
| Saturday |
Patchy fog before 8am. Mostly sunny, with a high near 74. |
| Saturday Night |
Partly cloudy, with a low around 55. |
| Sunday |
Mostly sunny, with a high near 70. |
| Sunday Night |
Partly cloudy, with a low around 56. |
| Monday |
Sunny, with a high near 75. |
| Monday Night |
Mostly clear, with a low around 56. |
| Tuesday |
Sunny, with a high near 78. |
Forecast from NOAA-NWS for Castro Valley, CA.
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