| National Weather Service Forecast for:
Castro Valley CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 1:36 pm PDT Jul 12, 2026 | ||||||||||||||||||
|
| This Afternoon |
Isolated showers. Partly sunny, with a high near 82. West wind around 6 mph. Chance of precipitation is 20%. |
| Tonight |
Mostly cloudy, with a low around 63. Light west wind. |
| Monday |
Partly sunny, with a high near 88. Calm wind becoming west 5 to 7 mph in the afternoon. |
| Monday Night |
Partly cloudy, with a low around 65. West wind around 6 mph becoming calm in the evening. |
| Tuesday |
Sunny, with a high near 87. Calm wind becoming west 5 to 9 mph in the afternoon. |
| Tuesday Night |
Mostly clear, with a low around 62. |
| Wednesday |
Sunny, with a high near 82. |
| Wednesday Night |
Partly cloudy, with a low around 57. |
| Thursday |
Mostly sunny, with a high near 76. |
| Thursday Night |
Partly cloudy, with a low around 57. |
| Friday |
Partly sunny, with a high near 77. |
| Friday Night |
Mostly cloudy, with a low around 59. |
| Saturday |
Partly sunny, with a high near 76. |
| Saturday Night |
Mostly cloudy, with a low around 60. |
| Sunday |
Partly sunny, with a high near 78. |
Forecast from NOAA-NWS for Castro Valley CA.
