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

Super Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather from the Southern Plains to the Great Lakes

Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, thunderstorms, and coastal impacts to the Marianas Islands into Wednesday. Typhoon conditions are likely over CNMI and tropical storm conditions over Guam. Severe thunderstorms and heavy rain are expected from the Southern Plains to the Great Lakes today. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Overcast

54°F

12°C

Humidity 81%
Wind Speed SW 6 MPH
Barometer 30.14 in (1020.66 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 14 Apr 04:35 AM PDT
Extended Forecast for

2 Miles SW Castro Valley CA

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 65. Light southwest wind becoming west 5 to 10 mph in the morning.

    High: 65 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 48. West southwest wind 5 to 9 mph.

    Low: 48 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 67. West wind 5 to 11 mph, with gusts as high as 18 mph.

    High: 67 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 49. West wind 6 to 11 mph, with gusts as high as 21 mph.

    Low: 49 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 70. North wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 65. Light southwest wind becoming west 5 to 10 mph in the morning.
Tonight
Increasing clouds, with a low around 48. West southwest wind 5 to 9 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 67. West wind 5 to 11 mph, with gusts as high as 18 mph.
Wednesday Night
Partly cloudy, with a low around 49. West wind 6 to 11 mph, with gusts as high as 21 mph.
Thursday
Sunny, with a high near 70. North wind 6 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Clear, with a low around 46.
Friday
Sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
A slight chance of rain. Partly sunny, with a high near 71.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 51.
Monday
A chance of rain. Partly sunny, with a high near 66.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Castro Valley CA
 37.69°N 122.07°W (Elev. 197 ft)
Last Update:
1:43 am PDT Apr 14, 2026
Forecast Valid:
4am PDT Apr 14, 2026-6pm PDT Apr 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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