National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
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| Updated: Tue, 27-Jan-2026 12:26pm PST | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
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| Tonight |
A chance of rain before 4am, then patchy fog. Mostly cloudy. Low around 50, with temperatures rising to around 52 overnight. South southeast wind 1 to 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible. |
| Wednesday |
Patchy fog before 7am. Mostly sunny. High near 64, with temperatures falling to around 60 in the afternoon. Northeast wind 2 to 6 mph. |
| Wednesday Night |
Mostly clear, with a low around 43. North northeast wind around 3 mph. |
| Thursday |
Mostly sunny, with a high near 66. Northeast wind 2 to 6 mph. |
| Thursday Night |
Partly cloudy, with a low around 46. Northeast wind around 5 mph. |
| Friday |
Partly sunny, with a high near 68. |
| Friday Night |
Mostly cloudy, with a low around 46. |
| Saturday |
Partly sunny, with a high near 68. |
| Saturday Night |
Mostly cloudy, with a low around 47. |
| Sunday |
A chance of rain after 10am. Partly sunny, with a high near 66. |
| Sunday Night |
A chance of rain before 4am. Mostly cloudy, with a low around 50. |
| Monday |
Mostly sunny, with a high near 64. |
| Monday Night |
Partly cloudy, with a low around 45. |
| Tuesday |
Sunny, with a high near 66. |
Forecast from NOAA-NWS for Castro Valley, CA.
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