National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Mon, 09-Mar-2026 8:04am PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny. High near 72, with temperatures falling to around 69 in the afternoon. West wind 2 to 8 mph. |
| Tonight |
Mostly clear, with a low around 47. South southwest wind around 7 mph. |
| Tuesday |
Sunny, with a high near 68. Southwest wind 3 to 8 mph. |
| Tuesday Night |
Mostly clear, with a low around 46. West southwest wind 2 to 8 mph. |
| Wednesday |
Sunny, with a high near 75. Northwest wind 2 to 7 mph. |
| Wednesday Night |
Mostly clear, with a low around 50. |
| Thursday |
Sunny, with a high near 79. |
| Thursday Night |
Mostly clear, with a low around 51. |
| Friday |
Sunny, with a high near 78. |
| Friday Night |
Mostly clear, with a low around 51. |
| Saturday |
Sunny, with a high near 78. |
| Saturday Night |
Partly cloudy, with a low around 54. |
| Sunday |
Mostly sunny, with a high near 80. |
| Sunday Night |
Partly cloudy, with a low around 55. |
Forecast from NOAA-NWS for Castro Valley, CA.
Alerts
