| 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 May 26, 2026 | ||||||||||||||||||
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| Tonight |
Partly cloudy, with a low around 51. West wind 9 to 14 mph becoming light and variable after midnight. Winds could gust as high as 24 mph. |
| Wednesday |
Mostly sunny, with a high near 70. Light and variable wind becoming west 5 to 9 mph in the afternoon. |
| Wednesday Night |
A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 52. West wind 5 to 7 mph becoming calm in the evening. |
| Thursday |
A 30 percent chance of rain. Partly sunny, with a high near 71. Calm wind becoming west 5 to 7 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible. |
| Thursday Night |
Partly cloudy, with a low around 53. West wind 5 to 10 mph becoming light west southwest after midnight. |
| Friday |
Mostly sunny, with a high near 68. |
| Friday Night |
Partly cloudy, with a low around 53. |
| Saturday |
Mostly sunny, with a high near 70. |
| Saturday Night |
Mostly clear, with a low around 51. |
| Sunday |
Sunny, with a high near 76. |
| Sunday Night |
Mostly clear, with a low around 53. |
| Monday |
Sunny, with a high near 80. |
| Monday Night |
Mostly clear, with a low around 54. |
| Tuesday |
Mostly sunny, with a high near 78. |
Forecast from NOAA-NWS for Castro Valley CA.
