National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Tue, 17-Feb-2026 12:27am PST | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Overnight |
Rain likely. Mostly cloudy, with a low around 44. West southwest wind around 12 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible. |
| Tuesday |
Rain before 10am, then showers and thunderstorms. Cloudy. High near 52, with temperatures falling to around 49 in the afternoon. Southwest wind 13 to 24 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible. |
| Tuesday Night |
Showers and thunderstorms before 10pm, then rain likely. Mostly cloudy, with a low around 40. West wind 3 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible. |
| Wednesday |
Rain likely. Mostly cloudy, with a high near 53. Southwest wind 3 to 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Wednesday Night |
Rain. Mostly cloudy, with a low around 43. South southwest wind 6 to 18 mph, with gusts as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible. |
| Thursday |
Rain. Mostly cloudy, with a high near 54. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Thursday Night |
A chance of rain. Mostly cloudy, with a low around 39. |
| Friday |
A chance of rain. Partly sunny, with a high near 56. |
| Friday Night |
A chance of rain. Mostly cloudy, with a low around 41. |
| Saturday |
A chance of rain. Partly sunny, with a high near 60. |
| Saturday Night |
Rain likely. Mostly cloudy, with a low around 47. |
| Sunday |
Rain. Mostly cloudy, with a high near 63. |
| Sunday Night |
Rain. Cloudy, with a low around 51. |
| Monday |
Rain before 5pm. Cloudy, with a high near 63. |
Forecast from NOAA-NWS for Castro Valley, CA.
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