National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Sun, 19-Apr-2026 1:26pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| This Afternoon |
Mostly sunny. High near 72, with temperatures falling to around 70 in the afternoon. West wind around 12 mph. |
| Tonight |
A chance of rain after 5am. Partly cloudy, with a low around 51. South southwest wind 6 to 12 mph. Chance of precipitation is 30%. |
| Monday |
Rain. Partly sunny. High near 71, with temperatures falling to around 65 in the afternoon. South wind 6 to 15 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. |
| Monday Night |
Rain. Cloudy, with a low around 54. Southwest wind 1 to 12 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible. |
| Tuesday |
Rain before 11am, then showers and thunderstorms. Cloudy, with a high near 64. South southwest wind 5 to 12 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible. |
| Tuesday Night |
Showers and thunderstorms likely before 8pm, then rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Wednesday |
A chance of rain before 5pm. Mostly sunny, with a high near 65. |
| Wednesday Night |
Mostly clear, with a low around 48. |
| Thursday |
Mostly sunny, with a high near 70. |
| Thursday Night |
Partly cloudy, with a low around 49. |
| Friday |
Mostly sunny, with a high near 72. |
| Friday Night |
Partly cloudy, with a low around 52. |
| Saturday |
Mostly sunny, with a high near 71. |
| Saturday Night |
Partly cloudy, with a low around 53. |
Forecast from NOAA-NWS for Castro Valley, CA.
Alerts
