National Weather Service Forecast for: Castro Valley, CAIssued by: National Weather Service San Francisco Bay Area/Monterey, CA |
||||||||||||||||||||||||||||||||||||||||
| Updated: Wed, 07-Jan-2026 12:26pm PST | ||||||||||||||||||||||||||||||||||||||||
| Castro Valley/Hayward | ||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||
| This Afternoon |
Mostly sunny. High near 58, with temperatures falling to around 54 in the afternoon. West wind around 10 mph. |
| Tonight |
Partly cloudy. Low around 42, with temperatures rising to around 44 overnight. West northwest wind around 10 mph, with gusts as high as 20 mph. |
| Thursday |
Sunny. High near 55, with temperatures falling to around 51 in the afternoon. North northwest wind around 9 mph, with gusts as high as 18 mph. |
| Thursday Night |
Mostly clear, with a low around 37. North northeast wind around 6 mph. |
| Friday |
Sunny, with a high near 55. Northeast wind around 6 mph. |
| Friday Night |
Areas of frost after 5am. Mostly clear, with a low around 36. |
| Saturday |
Areas of frost before 8am. Mostly sunny, with a high near 57. |
| Saturday Night |
Mostly cloudy, with a low around 39. |
| Sunday |
Partly sunny, with a high near 59. |
| Sunday Night |
Partly cloudy, with a low around 40. |
| Monday |
Sunny, with a high near 61. |
| Monday Night |
Mostly clear, with a low around 42. |
| Tuesday |
Sunny, with a high near 63. |
| Tuesday Night |
Mostly clear, with a low around 43. |
Forecast from NOAA-NWS for Castro Valley, CA.
Alerts
