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

Hot Temperatures in the West; Heavy Rainfall and Flooding Potential in the Southwest

Hot to extremely hot temperatures are in place across coastal southern California again today and the interior Northwest U.S into Thursday, with the Pacific Northwest carrying the potential for record-breaking high temperatures. A combination of monsoonal moisture and tropical moisture ahead of tropical cyclone Lorena will bring heavy rainfall and the potential for flooding through the week. Read More >

Current conditions at

Mount Diablo Summit Museum and Trailhead Rooftop (SJS02)

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

NA

73°F

23°C

Humidity 35%
Wind Speed SE 5 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 03 Sep 12:10 PM PDT
Extended Forecast for

4 Miles SSE Clayton CA

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 77. South southwest wind 6 to 10 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. South southwest wind 7 to 9 mph.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a steady temperature around 73. West southwest wind 9 to 13 mph.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Southwest wind around 11 mph.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 70. West southwest wind 10 to 14 mph.

    High: 70 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 77. South southwest wind 6 to 10 mph.
Tonight
Mostly clear, with a low around 68. South southwest wind 7 to 9 mph.
Thursday
Sunny, with a steady temperature around 73. West southwest wind 9 to 13 mph.
Thursday Night
Mostly clear, with a low around 66. Southwest wind around 11 mph.
Friday
Sunny, with a high near 70. West southwest wind 10 to 14 mph.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 72.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Sunny, with a high near 72.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 68.
Tuesday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Clayton CA
 37.87°N 121.92°W (Elev. 2818 ft)
Last Update:
11:44 am PDT Sep 3, 2025
Forecast Valid:
12pm PDT Sep 3, 2025-6pm PDT Sep 9, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation