National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Wed, 17-Dec-2025 1:24pm PST | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Widespread fog and patchy drizzle. Mostly cloudy, with a low around 47. East southeast wind around 2 mph. |
| Thursday |
Widespread fog and patchy drizzle before noon. Partly sunny. High near 62, with temperatures falling to around 57 in the afternoon. West wind around 3 mph. |
| Thursday Night |
A slight chance of rain between 10pm and 2am, then a chance of rain and patchy fog. Mostly cloudy. Low around 50, with temperatures rising to around 52 overnight. Southwest wind around 3 mph. Chance of precipitation is 30%. |
| Friday |
Rain. Mostly cloudy, with a high near 63. South wind 3 to 8 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible. |
| Friday Night |
Rain. Cloudy, with a low around 54. South southwest wind 3 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible. |
| Saturday |
Rain. Mostly cloudy, with a high near 60. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible. |
| Saturday Night |
Rain before 10pm, then showers and thunderstorms. Cloudy, with a low around 55. |
| Sunday |
Showers and thunderstorms before 4pm, then rain. Cloudy, with a high near 61. |
| Sunday Night |
Rain. Cloudy, with a low around 53. |
| Monday |
Rain likely. Mostly cloudy, with a high near 60. |
| Monday Night |
Rain likely. Mostly cloudy, with a low around 49. |
| Tuesday |
Rain likely. Mostly cloudy, with a high near 58. |
| Tuesday Night |
Rain. Mostly cloudy, with a low around 49. |
| Wednesday |
Rain likely before 5pm. Mostly cloudy, with a high near 58. |
Forecast from NOAA-NWS for Castro Valley, CA.
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