National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Widespread Rain from Texas to the Central Appalachians; Heavy to Excessive Rainfall in Southern California and the Southwest

Scattered thunderstorms and widespread showers are expected from the Texas coast to the central Appalachians today. Heavy to excessive rainfall will continue in southern California into the Desert Southwest through Saturday. Heavy rain will pose a risk of flash flooding, especially across burn scar and urbanized regions. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

Lat: 37.66083°NLon: 122.11833°WElev: 46.0ft.

Clear

63°F

17°C

Humidity 51%
Wind Speed SW 5 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 21 Nov 04:00 PM PST
Extended Forecast for

Castro Valley CA

  • Tonight

    Tonight: Clear, with a low around 46. Calm wind.

    Low: 46 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 65. Calm wind becoming northwest around 5 mph.

    High: 65 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 47. Calm wind.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 62. Calm wind becoming west around 5 mph in the afternoon.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 47. Calm wind.

    Low: 47 °F

    Partly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63.

    High: 63 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 46. Calm wind.
Saturday
Sunny, with a high near 65. Calm wind becoming northwest around 5 mph.
Saturday Night
Partly cloudy, with a low around 47. Calm wind.
Sunday
Mostly sunny, with a high near 62. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Patchy fog after 5am. Otherwise, partly cloudy, with a low around 47. Calm wind.
Monday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 47.
Thanksgiving Day
Mostly sunny, with a high near 65.
Thursday Night
Mostly cloudy, with a low around 49.
Friday
A slight chance of rain. Mostly cloudy, with a high near 62.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.07°W (Elev. 197 ft)
Last Update:
12:33 pm PST Nov 21, 2025
Forecast Valid:
4pm PST Nov 21, 2025-6pm PST Nov 28, 2025
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation