Severe Thunderstorms and Flooding from the Southern Plains to the Great Lakes; Record Heat in the East

Widely scattered severe thunderstorms may produce damaging winds, hail, and flash flooding from the southern Plains into the lower Great Lakes. Elevated to locally critical fire weather conditions will persist across portions of the Southwest and Southern High Plains due to gusty winds and dry conditions. An early-season heatwave will challenge temperature records 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

56°F

13°C

Humidity 28%
Wind Speed NW 9 MPH
Barometer NA
Dewpoint 23°F (-5°C)
Visibility NA
Last update 17 May 05:05 PM PDT
Extended Forecast for

4 Miles SSE Clayton CA

  • Overnight

    Overnight: Clear, with a low around 63. West northwest wind 7 to 9 mph.

    Low: 63 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 75. Light and variable wind becoming west southwest 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 60. West southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 60 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 80. West wind 7 to 10 mph, with gusts as high as 22 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58. Southwest wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 63. West northwest wind 7 to 9 mph.
Wednesday
Sunny, with a high near 75. Light and variable wind becoming west southwest 6 to 11 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Clear, with a low around 60. West southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 80. West wind 7 to 10 mph, with gusts as high as 22 mph.
Thursday Night
Mostly clear, with a low around 58. Southwest wind 11 to 13 mph, with gusts as high as 23 mph.
Friday
Sunny, with a high near 73.
Friday Night
Mostly clear, with a low around 56.
Saturday
Sunny, with a high near 66.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 72.
Sunday Night
Mostly clear, with a low around 50.
Memorial Day
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
11:26 pm PDT May 19, 2026
1am PDT May 20, 2026-6pm PDT May 26, 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