National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Sat, 09-May-2026 1:31pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly cloudy, with a low around 54. West southwest wind around 10 mph, with gusts as high as 18 mph. |
| Sunday |
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. West southwest wind around 9 mph. |
| Sunday Night |
Partly cloudy, with a low around 54. Southwest wind 1 to 8 mph. |
| Monday |
Mostly sunny, with a high near 88. West southwest wind 0 to 8 mph. |
| Monday Night |
Partly cloudy, with a low around 56. West wind 1 to 8 mph. |
| Tuesday |
Mostly sunny, with a high near 81. |
| Tuesday Night |
Partly cloudy, with a low around 55. |
| Wednesday |
Mostly sunny, with a high near 75. |
| Wednesday Night |
Mostly clear, with a low around 54. |
| Thursday |
Sunny, with a high near 76. |
| Thursday Night |
Mostly clear, with a low around 54. |
| Friday |
Sunny, with a high near 77. |
| Friday Night |
Mostly clear, with a low around 53. |
| Saturday |
Sunny, with a high near 77. |
Forecast from NOAA-NWS for Castro Valley, CA.
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