National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Sun, 18-Oct-2026 1:47pm PDT | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| This Afternoon |
Sunny. High near 73, with temperatures falling to around 68 in the afternoon. West wind around 9 mph. |
| Tonight |
Mostly cloudy. Low around 53, with temperatures rising to around 55 overnight. West southwest wind around 10 mph, with gusts as high as 18 mph. |
| Monday |
Partly sunny. High near 64, with temperatures falling to around 61 in the afternoon. West southwest wind around 10 mph. |
| Monday Night |
Mostly cloudy, with a low around 51. Southwest wind 1 to 9 mph. |
| Tuesday |
A chance of rain after 5pm. Mostly cloudy, with a high near 68. South wind 1 to 6 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible. |
| Tuesday Night |
Rain likely. Mostly cloudy, with a low around 54. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Wednesday |
Rain likely. Mostly cloudy, with a high near 67. |
| Wednesday Night |
A chance of rain. Mostly cloudy, with a low around 54. |
| Thursday |
A chance of rain before 7am, then a chance of rain and patchy fog between 7am and 11am. Partly sunny, with a high near 65. |
| Thursday Night |
Partly cloudy, with a low around 53. |
| Friday |
Sunny, with a high near 67. |
| Friday Night |
Mostly clear, with a low around 51. |
| Saturday |
Sunny, with a high near 69. |
| Saturday Night |
A slight chance of rain after 11pm. Partly cloudy, with a low around 52. |
Forecast from NOAA-NWS for Castro Valley, CA.
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