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

Critical Fire Weather in the High Plains; Heat Continues in the West

Critical fire weather conditions will persist in the central High Plains through Friday as gusty winds and dry conditions continue. The heat wave across the West and Southwest will continue to intensify through the week, with daily and monthly record highs expected to be broken. Read More >

Hazardous Weather Conditions

Current conditions at

SJSU - Mount Diablo Summit Museum Rooftop (SJS02)

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

NA

75°F

24°C

Humidity 43%
Wind Speed SSW 4 MPH
Barometer NA
Dewpoint 51°F (11°C)
Visibility NA
Last update 18 Mar 04:10 PM PDT
Extended Forecast for

Clayton CA

Heat Advisory March 18, 08:14pm until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 18, 08:14pm until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 63 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Light and variable wind becoming northeast around 6 mph in the morning.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 65. West southwest wind around 5 mph becoming calm after midnight.

    Low: 65 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63. West northwest wind around 7 mph becoming southwest in the evening.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

Detailed Forecast

Tonight
Clear, with a low around 63. West northwest wind around 5 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 88. Light and variable wind becoming northeast around 6 mph in the morning.
Thursday Night
Clear, with a low around 65. West southwest wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 63. West northwest wind around 7 mph becoming southwest in the evening.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Sunny, with a high near 79.
Sunday Night
Mostly clear, with a low around 52.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clayton CA
 37.91°N 121.96°W (Elev. 1299 ft)
Last Update:
3:12 pm PDT Mar 18, 2026
Forecast Valid:
8pm PDT Mar 18, 2026-6pm PDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation