National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Wed, 29-Jul-2026 1:25pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| This Afternoon |
Sunny. High near 78, with temperatures falling to around 74 in the afternoon. West southwest wind around 10 mph. |
| Tonight |
Partly cloudy, with a low around 57. Southwest wind 5 to 9 mph. |
| Thursday |
Mostly sunny. High near 78, with temperatures falling to around 76 in the afternoon. Southwest wind 5 to 9 mph. |
| Thursday Night |
Partly cloudy, with a low around 56. Southwest wind 3 to 8 mph. |
| Friday |
Mostly sunny, with a high near 83. West southwest wind 3 to 9 mph. |
| Friday Night |
Partly cloudy, with a low around 58. |
| Saturday |
Mostly sunny, with a high near 85. |
| Saturday Night |
Mostly clear, with a low around 58. |
| Sunday |
Sunny, with a high near 85. |
| Sunday Night |
Mostly clear, with a low around 59. |
| Monday |
Sunny, with a high near 86. |
| Monday Night |
Mostly clear, with a low around 60. |
| Tuesday |
Sunny, with a high near 85. |
| Tuesday Night |
Partly cloudy, with a low around 60. |
Forecast from NOAA-NWS for Castro Valley, CA.
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