National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Mon, 28-Sep-2026 3:04am PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Overnight |
A slight chance of drizzle. Mostly cloudy. Low around 55, with temperatures rising to around 57 overnight. Southwest wind around 7 mph. |
| Monday |
A slight chance of drizzle before 8am. Mostly sunny. High near 75, with temperatures falling to around 72 in the afternoon. West southwest wind 3 to 9 mph. |
| Monday Night |
Mostly clear, with a low around 56. South wind 1 to 7 mph. |
| Tuesday |
Sunny, with a high near 84. West southwest wind 1 to 8 mph. |
| Tuesday Night |
Mostly clear, with a low around 59. Southwest wind 1 to 6 mph. |
| Wednesday |
Sunny, with a high near 89. |
| Wednesday Night |
Mostly clear, with a low around 60. |
| Thursday |
Sunny, with a high near 88. |
| Thursday Night |
Partly cloudy, with a low around 61. |
| Friday |
Mostly sunny, with a high near 84. |
| Friday Night |
Partly cloudy, with a low around 61. |
| Saturday |
Mostly sunny, with a high near 85. |
| Saturday Night |
Mostly clear, with a low around 61. |
| Sunday |
Sunny, with a high near 86. |
Forecast from NOAA-NWS for Castro Valley, CA.
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