Severe Weather in the Central Plains; Fire Concerns in the Southern High Plains and Southwest; Late-Season Mountain Snow

Severe storms, including large hail, wind, and perhaps a couple of tornadoes, are possible in the central Plains. Dry, windy conditions and lightning from dry thunderstorms may produce hazardous fire conditions in the Southwest and southern High Plains. Late-season snow is expected in the Northwest and the Great Basin. Heat is spreading across the eastern U.S.. Read More >

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

57°F

14°C

Humidity 48%
Wind Speed WNW 5 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 16 May 12:50 PM PDT
Extended Forecast for

4 Miles SSE Clayton CA

  • Tonight

    Tonight: Mostly clear, with a low around 46. West northwest wind 13 to 15 mph, with gusts as high as 29 mph.

    Low: 46 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 73. Breezy, with a north northwest wind 13 to 22 mph, with gusts as high as 39 mph.

    High: 73 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Clear, with a temperature rising to around 73 by 11pm. Breezy, with a north wind 21 to 25 mph, with gusts as high as 55 mph.

    Low: 66 °F

    Clear and
    Breezy

  • Monday

    Monday: Sunny, with a high near 77. Breezy, with a north wind 23 to 28 mph decreasing to 16 to 21 mph in the afternoon. Winds could gust as high as 55 mph.

    High: 77 °F

    Sunny and
    Breezy

  • Monday Night

    Monday Night: Clear, with a low around 59. North northwest wind 8 to 11 mph becoming west southwest in the evening. Winds could gust as high as 21 mph.

    Low: 59 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 57.

    Low: 57 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 46. West northwest wind 13 to 15 mph, with gusts as high as 29 mph.
Sunday
Sunny, with a high near 73. Breezy, with a north northwest wind 13 to 22 mph, with gusts as high as 39 mph.
Sunday Night
Clear, with a temperature rising to around 73 by 11pm. Breezy, with a north wind 21 to 25 mph, with gusts as high as 55 mph.
Monday
Sunny, with a high near 77. Breezy, with a north wind 23 to 28 mph decreasing to 16 to 21 mph in the afternoon. Winds could gust as high as 55 mph.
Monday Night
Clear, with a low around 59. North northwest wind 8 to 11 mph becoming west southwest in the evening. Winds could gust as high as 21 mph.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Clear, with a low around 57.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Sunny, with a high near 86.
Thursday Night
Clear, with a low around 55.
Friday
Sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 53.
Saturday
Sunny, with a high near 73.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
1:26 pm PDT May 16, 2026
4pm PDT May 16, 2026-6pm PDT May 23, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database