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.

Overcast

48°F

9°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.09 in (1018.96 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 23 Nov 04:35 AM PST
Extended Forecast for

Castro Valley CA

  • Today

    Today: Patchy dense fog between 8am and 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming west around 6 mph in the afternoon.

    High: 63 °F

    Patchy Dense
    Fog then
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 64. North wind around 6 mph.

    High: 64 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 44. East wind 3 to 6 mph.

    Low: 44 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 64. North northeast wind around 7 mph.

    High: 64 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy dense fog between 8am and 10am. Otherwise, mostly sunny, with a high near 63. Calm wind becoming west around 6 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 46. Calm wind.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 64. North wind around 6 mph.
Monday Night
Mostly clear, with a low around 44. East wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 64. North northeast wind around 7 mph.
Tuesday Night
Partly cloudy, with a low around 44.
Wednesday
Mostly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 44.
Thanksgiving Day
Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Partly sunny, with a high near 61.
Friday Night
Mostly cloudy, with a low around 46.
Saturday
A slight chance of rain. Mostly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castro Valley CA
 37.69°N 122.05°W (Elev. 364 ft)
Last Update:
12:31 am PST Nov 23, 2025
Forecast Valid:
4am PST Nov 23, 2025-6pm PST Nov 29, 2025
 
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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