National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Thu, 09-Jul-2026 8:15am PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny. High near 77, with temperatures falling to around 74 in the afternoon. West southwest wind 3 to 9 mph. |
| Tonight |
Partly cloudy, with a low around 57. Southwest wind 5 to 8 mph. |
| Friday |
Mostly sunny. High near 74, with temperatures falling to around 70 in the afternoon. Southwest wind 6 to 10 mph. |
| Friday Night |
Mostly cloudy, with a low around 56. Southwest wind 3 to 9 mph. |
| Saturday |
Partly sunny, with a high near 79. Southwest wind 3 to 8 mph. |
| Saturday Night |
Mostly cloudy, with a low around 60. |
| Sunday |
Partly sunny, with a high near 81. |
| Sunday Night |
Mostly cloudy, with a low around 62. |
| Monday |
Mostly sunny, with a high near 83. |
| Monday Night |
Partly cloudy, with a low around 61. |
| Tuesday |
Sunny, with a high near 82. |
| Tuesday Night |
Mostly clear, with a low around 60. |
| Wednesday |
Sunny, with a high near 80. |
| Wednesday Night |
Partly cloudy, with a low around 58. |
Forecast from NOAA-NWS for Castro Valley, CA.
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