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

Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, and thunderstorms to the Marianas Islands into Wednesday. Tropical Storm conditions are likely over Guam. Severe thunderstorms and heavy rain are likely across the Upper Mississippi Valley and Great Lakes region with potential for large to very large hail, damaging wind, and tornadoes through Tuesday. Read More >

Current conditions at

Hayward, Hayward Air Terminal (KHWD)

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

Partly Cloudy

57°F

14°C

Humidity 67%
Wind Speed ESE 4 MPH
Barometer 30.13 in (1020.32 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 13 Apr 10:30 AM PDT
Extended Forecast for

3 Miles WNW Castro Valley CA

  • Today

    Today: Sunny, with a high near 65. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 48. Southwest wind 6 to 8 mph.

    Low: 48 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 64. West southwest wind 5 to 10 mph.

    High: 64 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 48. West wind 6 to 10 mph.

    Low: 48 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 66. West wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 66 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 48.

    Low: 48 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 65. Calm wind becoming west 5 to 9 mph in the afternoon.
Tonight
Increasing clouds, with a low around 48. Southwest wind 6 to 8 mph.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 64. West southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 48. West wind 6 to 10 mph.
Wednesday
Mostly sunny, with a high near 66. West wind 6 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Sunny, with a high near 69.
Thursday Night
Clear, with a low around 48.
Friday
Sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 72.
Saturday Night
Mostly cloudy, with a low around 50.
Sunday
A slight chance of showers. Partly sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Castro Valley CA
 37.73°N 122.11°W (Elev. 397 ft)
8:52 am PDT Apr 13, 2026
10am PDT Apr 13, 2026-6pm PDT Apr 19, 2026
 
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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