National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Wed, 18-Feb-2026 5:13pm PST | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Rain. Cloudy. Low around 42, with temperatures rising to around 44 overnight. South southeast wind 7 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible. |
| Thursday |
Rain. Partly sunny. High near 53, with temperatures falling to around 49 in the afternoon. West wind 14 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Thursday Night |
A slight chance of rain before 10pm. Mostly clear, with a low around 38. Northwest wind 1 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 20%. |
| Friday |
Partly sunny, with a high near 54. South southeast wind around 3 mph. |
| Friday Night |
Partly cloudy, with a low around 39. Southeast wind 2 to 6 mph. |
| Saturday |
A chance of rain after 10am. Mostly cloudy, with a high near 60. Chance of precipitation is 30%. |
| Saturday Night |
Rain. Mostly cloudy, with a low around 49. |
| Sunday |
Rain. Mostly cloudy, with a high near 64. |
| Sunday Night |
Rain. Mostly cloudy, with a low around 54. |
| Monday |
Rain. Mostly cloudy, with a high near 65. |
| Monday Night |
Rain. Mostly cloudy, with a low around 53. |
| Tuesday |
Rain. Mostly cloudy, with a high near 64. |
| Tuesday Night |
Rain. Mostly cloudy, with a low around 48. |
| Wednesday |
Rain likely before 5pm. Partly sunny, with a high near 62. |
Forecast from NOAA-NWS for Castro Valley, CA.
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