National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Mon, 12-Oct-2026 3:12am PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Columbus Day |
Sunny, with a high near 68. North northwest wind 2 to 8 mph. |
| Tonight |
Mostly clear, with a low around 51. South southeast wind 0 to 7 mph. |
| Tuesday |
Sunny. High near 72, with temperatures falling to around 70 in the afternoon. North northwest wind 1 to 8 mph. |
| Tuesday Night |
Mostly clear, with a low around 51. West southwest wind 0 to 8 mph. |
| Wednesday |
Sunny, with a high near 76. West northwest wind 0 to 6 mph. |
| Wednesday Night |
Mostly clear, with a low around 55. |
| Thursday |
Sunny, with a high near 84. |
| Thursday Night |
Mostly clear, with a low around 58. |
| Friday |
Sunny, with a high near 88. |
| Friday Night |
Mostly clear, with a low around 61. |
| Saturday |
Sunny, with a high near 87. |
| Saturday Night |
Mostly clear, with a low around 58. |
| Sunday |
Sunny, with a high near 76. |
| Sunday Night |
Mostly clear, with a low around 55. |
Forecast from NOAA-NWS for Castro Valley, CA.
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