| National Weather Service Forecast for:
Castro Valley CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 1:26 pm PDT Jun 29, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 56. Southwest wind 3 to 6 mph. |
| Tuesday |
Sunny, with a high near 77. Light southwest wind becoming west 5 to 10 mph in the morning. |
| Tuesday Night |
Increasing clouds, with a low around 55. South southwest wind 7 to 10 mph. |
| Wednesday |
Mostly cloudy, then gradually becoming sunny, with a high near 74. South southwest wind 7 to 10 mph, with gusts as high as 18 mph. |
| Wednesday Night |
Partly cloudy, with a low around 55. South southwest wind 10 to 13 mph, with gusts as high as 22 mph. |
| Thursday |
Mostly sunny, with a high near 72. |
| Thursday Night |
Partly cloudy, with a low around 55. |
| Friday |
Mostly sunny, with a high near 76. |
| Friday Night |
Partly cloudy, with a low around 56. |
| Independence Day |
Mostly sunny, with a high near 76. |
| Saturday Night |
Partly cloudy, with a low around 56. |
| Sunday |
Mostly sunny, with a high near 75. |
| Sunday Night |
Mostly cloudy, with a low around 56. |
| Monday |
Mostly sunny, with a high near 73. |
Forecast from NOAA-NWS for Castro Valley CA.
