Severe Weather Across the Center of the Nation; Fire Weather Concerns for Southwest and California; Snow for the Central Rockies

Severe thunderstorms will continue to impact the center of the Nation through today. Very large hail, strong tornadoes, and damaging winds are expected from the Great Lakes into the central/southern Plains; Flash flooding is possible for portions into the mid-Mississippi Valley. Critical fire weather conditions for the Southwest and central valley of California today. Winter hangs on for Rockies. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

81°F

27°C

Humidity 16%
Wind Speed NNW 11 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 18 May 01:54 PM PDT
Extended Forecast for

4 Miles E Saint Helena CA

Coastal Flood Advisory May 18, 02:05pm until May 19, 03:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory May 18, 02:05pm until May 19, 03:00am

    NOW until 3:00am Tue

    Coastal Flood Advisory

  • This Afternoon

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 54. North wind around 6 mph becoming calm  after midnight.

    Low: 54 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. North wind 3 to 6 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 55. Northwest wind around 5 mph becoming calm  in the evening.

    Low: 55 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 51.

    Low: 51 °F

    Clear

Detailed Forecast

This Afternoon
Sunny, with a high near 85. North wind around 9 mph, with gusts as high as 21 mph.
Tonight
Clear, with a low around 54. North wind around 6 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 89. North wind 3 to 6 mph.
Tuesday Night
Increasing clouds, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 90.
Thursday Night
Clear, with a low around 51.
Friday
Sunny, with a high near 84.
Friday Night
Patchy fog after 3am. Otherwise, mostly clear, with a low around 49.
Saturday
Patchy fog. Otherwise, sunny, with a high near 79.
Saturday Night
Patchy fog. Otherwise, mostly clear, with a low around 48.
Sunday
Patchy fog. Otherwise, mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
1:26 pm PDT May 18, 2026
2pm PDT May 18, 2026-6pm PDT May 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