National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Mon, 07-Sep-2026 1:25pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 61. South wind 0 to 7 mph. |
| Tuesday |
Sunny. High near 88, with temperatures falling to around 85 in the afternoon. Northwest wind 0 to 7 mph. |
| Tuesday Night |
Mostly cloudy, with a low around 67. West wind 0 to 6 mph. |
| Wednesday |
Partly sunny, with a high near 93. North northwest wind 0 to 8 mph. |
| Wednesday Night |
Partly cloudy, with a low around 69. West southwest wind 1 to 8 mph. |
| Thursday |
Sunny, with a high near 86. |
| Thursday Night |
Partly cloudy, with a low around 62. |
| Friday |
Mostly sunny, with a high near 78. |
| Friday Night |
Partly cloudy, with a low around 59. |
| Saturday |
Sunny, with a high near 75. |
| Saturday Night |
Partly cloudy, with a low around 58. |
| Sunday |
Sunny, with a high near 77. |
| Sunday Night |
Partly cloudy, with a low around 58. |
| Monday |
Mostly sunny, with a high near 76. |
Forecast from NOAA-NWS for Castro Valley, CA.
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