Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Hazardous Weather Conditions

Current conditions at

LYONS VALLEY (COWC1)

Lat: 39.12583°NLon: 123.07333°WElev: 3355.0ft.

NA

90°F

32°C

Humidity 20%
Wind Speed SE 7 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Heat Index86°F (30°C)
Last update 04 Aug 10:01 AM PDT
Extended Forecast for

5 Miles SW Lakeport CA

Heat Advisory August 4, 10:32am until August 4, 11:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 4, 10:32am until August 4, 11:00pm

    NOW until 11:00pm Tue

    Heat Advisory

  • Today

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 72. Southwest wind 8 to 13 mph becoming light west  in the evening.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91. Light south southwest wind becoming southwest 8 to 13 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable  in the evening.

    Low: 70 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 72. West southwest wind 5 to 9 mph becoming calm  in the evening. Winds could gust as high as 18 mph.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 93. Light west wind becoming southwest 8 to 13 mph in the afternoon.
Tonight
Mostly clear, with a low around 72. Southwest wind 8 to 13 mph becoming light west in the evening.
Wednesday
Sunny, with a high near 91. Light south southwest wind becoming southwest 8 to 13 mph in the afternoon. Winds could gust as high as 18 mph.
Wednesday Night
Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Thursday
Sunny, with a high near 91. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 72. West southwest wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Friday
Sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 71.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW Lakeport CA
 38.99°N 122.99°W (Elev. 2595 ft)
10:05 am PDT Aug 4, 2026
10am PDT Aug 4, 2026-6pm PDT Aug 10, 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