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

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Hazardous Weather Conditions

Current conditions at

Napa, Napa County Airport (KAPC)

Lat: 38.2075°NLon: 122.27944°WElev: 33.0ft.

Clear

50°F

10°C

Humidity 93%
Wind Speed N 0 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 18 Mar 05:15 AM PDT
Extended Forecast for

7 Miles SSE Lake Berryessa CA

Heat Advisory March 18, 05:42am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 18, 05:42am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 58. Calm wind.

    Low: 58 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 90. Light north wind.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 60. Calm wind.

    Low: 60 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 90. Light northwest wind.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 87. Calm wind.
Tonight
Clear, with a low around 58. Calm wind.
Thursday
Sunny, with a high near 90. Light north wind.
Thursday Night
Clear, with a low around 60. Calm wind.
Friday
Sunny, with a high near 90. Light northwest wind.
Friday Night
Partly cloudy, with a low around 59.
Saturday
Mostly sunny, with a high near 84.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 52.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles SSE Lake Berryessa CA
 38.48°N 122.22°W (Elev. 1798 ft)
1:59 am PDT Mar 18, 2026
5am PDT Mar 18, 2026-6pm PDT Mar 24, 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