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

Sinlaku Continues to Impact the Marianas; Severe Weather from the Central US to the Northeast; Late-Season Snow in the Northwest

Sinlaku continues to bring destructive winds, widespread heavy rain/flooding, and storm surge to the Marianas. Showers and severe thunderstorms are expected from the Northeast to the Mid-Mississippi Valley and to the Central/Southern Plains through Thursday. A front will produce late-season snowfall over the Cascades and Northern Rockies and coastal rain over the Northwest Coast through Thursday. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

46°F

8°C

Humidity 34%
Wind Speed W 7 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Wind Chill42°F (6°C)
Last update 15 Apr 04:40 AM PDT
Extended Forecast for

4 Miles S Clayton CA

  • Today

    Today: Mostly sunny, with a high near 55. West southwest wind 14 to 17 mph, with gusts as high as 30 mph.

    High: 55 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. West southwest wind 13 to 18 mph, with gusts as high as 36 mph.

    Low: 40 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 55. Breezy, with a north wind 16 to 24 mph, with gusts as high as 43 mph.

    High: 55 °F

    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Clear, with a low around 46. North northwest wind 13 to 18 mph, with gusts as high as 40 mph.

    Low: 46 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 61. North wind 10 to 14 mph, with gusts as high as 26 mph.

    High: 61 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain, mainly after 11am. Partly sunny, with a high near 61.

    High: 61 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 55. West southwest wind 14 to 17 mph, with gusts as high as 30 mph.
Tonight
Partly cloudy, with a low around 40. West southwest wind 13 to 18 mph, with gusts as high as 36 mph.
Thursday
Sunny, with a high near 55. Breezy, with a north wind 16 to 24 mph, with gusts as high as 43 mph.
Thursday Night
Clear, with a low around 46. North northwest wind 13 to 18 mph, with gusts as high as 40 mph.
Friday
Sunny, with a high near 61. North wind 10 to 14 mph, with gusts as high as 26 mph.
Friday Night
Mostly clear, with a low around 45.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 50.
Sunday
A chance of rain, mainly after 11am. Partly sunny, with a high near 61.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 49.
Monday
A chance of rain. Partly sunny, with a high near 57.
Monday Night
A chance of rain. Mostly cloudy, with a low around 49.
Tuesday
A chance of rain. Partly sunny, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
1:56 am PDT Apr 15, 2026
Forecast Valid:
9am PDT Apr 15, 2026-6pm PDT Apr 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation