Super Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather Threat 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 the Northern Mariana Islands. Severe thunderstorms and heavy rain are expected from the Southern Plains to the Great Lakes through Tuesday. Heavy snow is expected in the Pacific Northwest. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

42°F

6°C

Humidity 84%
Wind Speed W 7 MPH
Barometer NA
Dewpoint 38°F (3°C)
Visibility NA
Wind Chill38°F (3°C)
Last update 13 Apr 10:20 PM PDT
Extended Forecast for

4 Miles S Clayton CA

  • Tonight

    Tonight: Mostly clear, with a low around 45. West southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 53. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 53 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 43. West southwest wind 11 to 14 mph, with gusts as high as 26 mph.

    Low: 43 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 55. West southwest wind 13 to 17 mph, with gusts as high as 26 mph.

    High: 55 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46. West southwest wind 16 to 18 mph, with gusts as high as 36 mph.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Friday Night

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

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 45. West southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 53. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
Partly cloudy, with a low around 43. West southwest wind 11 to 14 mph, with gusts as high as 26 mph.
Wednesday
Partly sunny, with a high near 55. West southwest wind 13 to 17 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 46. West southwest wind 16 to 18 mph, with gusts as high as 36 mph.
Thursday
Sunny, with a high near 56.
Thursday Night
Clear, with a low around 45.
Friday
Sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 49.
Sunday
A slight chance of rain. Mostly sunny, with a high near 59.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 49.
Monday
A chance of rain. Partly sunny, with a high near 54.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
11:26 pm PDT Apr 13, 2026
11pm PDT Apr 13, 2026-6pm PDT Apr 20, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database