National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Tue, 13-Oct-2026 1:26pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| This Afternoon |
Sunny. High near 73, with temperatures falling to around 71 in the afternoon. Northwest wind around 9 mph. |
| Tonight |
Mostly clear, with a low around 52. South wind 0 to 7 mph. |
| Wednesday |
Sunny, with a high near 76. South southwest wind 0 to 6 mph. |
| Wednesday Night |
Clear, with a low around 54. North wind 0 to 5 mph. |
| Thursday |
Sunny, with a high near 84. North northeast wind 0 to 6 mph. |
| Thursday Night |
Clear, with a low around 58. |
| Friday |
Sunny, with a high near 88. |
| Friday Night |
Mostly clear, with a low around 60. |
| Saturday |
Sunny, with a high near 84. |
| Saturday Night |
Mostly clear, with a low around 57. |
| Sunday |
Sunny, with a high near 69. |
| Sunday Night |
Partly cloudy, with a low around 54. |
| Monday |
A slight chance of rain after 5pm. Mostly sunny, with a high near 65. |
| Monday Night |
A slight chance of rain. Partly cloudy, with a low around 51. |
Forecast from NOAA-NWS for Castro Valley, CA.
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