National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Mon, 15-Jun-2026 1:26pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy, with a low around 57. West wind 2 to 8 mph. |
| Tuesday |
Mostly sunny. High near 79, with temperatures falling to around 76 in the afternoon. West wind 2 to 10 mph. |
| Tuesday Night |
Mostly clear, with a low around 59. West wind 2 to 9 mph. |
| Wednesday |
Sunny, with a high near 80. West southwest wind 2 to 10 mph. |
| Wednesday Night |
Partly cloudy, with a low around 58. West southwest wind 3 to 10 mph. |
| Thursday |
Mostly sunny, with a high near 78. |
| Thursday Night |
Partly cloudy, with a low around 58. |
| Juneteenth |
Mostly sunny, with a high near 75. |
| Friday Night |
Partly cloudy, with a low around 57. |
| Saturday |
Mostly sunny, with a high near 73. |
| Saturday Night |
Patchy fog after 2am. Partly cloudy, with a low around 55. |
| Sunday |
Patchy fog before 7am. Mostly sunny, with a high near 74. |
| Sunday Night |
Patchy fog after 2am. Partly cloudy, with a low around 55. |
| Monday |
Mostly sunny, with a high near 76. |
Forecast from NOAA-NWS for Castro Valley, CA.
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