| National Weather Service Forecast for:
Castro Valley CA Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: 10:26 pm PST Nov 1, 2026 | ||||||||||||||||||
|
| Tonight |
Increasing clouds, with a low around 49. Calm wind. |
| Monday |
Partly sunny, with a high near 68. Light and variable wind. |
| Monday Night |
Cloudy, then gradually becoming partly cloudy, with a low around 51. Calm wind. |
| Tuesday |
Rain likely, mainly after 3pm. Mostly cloudy, with a high near 65. South southwest wind around 7 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible. |
| Tuesday Night |
A 20 percent chance of rain before 10pm. Partly cloudy, with a low around 50. Light northeast wind. |
| Wednesday |
Mostly sunny, with a high near 68. |
| Wednesday Night |
Partly cloudy, with a low around 51. |
| Thursday |
Mostly sunny, with a high near 70. |
| Thursday Night |
Mostly clear, with a low around 51. |
| Friday |
Mostly sunny, with a high near 73. |
| Friday Night |
Mostly clear, with a low around 53. |
| Saturday |
Sunny, with a high near 76. |
| Saturday Night |
Mostly clear, with a low around 53. |
| Sunday |
Mostly sunny, with a high near 76. |
Forecast from NOAA-NWS for Castro Valley CA.
