| 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 Apr 6, 2026 | ||||||||||||||||||
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| Tonight |
Mostly cloudy, with a low around 51. West southwest wind 6 to 8 mph. |
| Tuesday |
Mostly cloudy through mid morning, then gradual clearing, with a high near 71. West southwest wind 5 to 9 mph. |
| Tuesday Night |
Partly cloudy, with a low around 52. West wind 5 to 9 mph. |
| Wednesday |
Sunny, with a high near 75. Light southwest wind becoming west 5 to 9 mph in the afternoon. |
| Wednesday Night |
Mostly cloudy, with a low around 57. West wind 5 to 10 mph becoming light west southwest after midnight. Winds could gust as high as 18 mph. |
| Thursday |
A 30 percent chance of rain after 11am. Partly sunny, with a high near 74. New precipitation amounts of less than a tenth of an inch possible. |
| Thursday Night |
A 30 percent chance of rain. Mostly cloudy, with a low around 55. |
| Friday |
Rain likely before 11am, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 72. |
| Friday Night |
A chance of rain. Mostly cloudy, with a low around 53. |
| Saturday |
A chance of rain. Partly sunny, with a high near 69. |
| Saturday Night |
A chance of rain. Mostly cloudy, with a low around 50. |
| Sunday |
A chance of rain. Mostly sunny, with a high near 67. |
| Sunday Night |
Partly cloudy, with a low around 48. |
| Monday |
Mostly sunny, with a high near 70. |
Forecast from NOAA-NWS for Castro Valley CA.
