Dangerous Fire Conditions in the Southern High Plains; Severe Weather from the Great Lakes into Central/Southern Plains; Late-Season Mountain Snow

Dry and windy conditions will produce dangerous fire weather conditions across the southern High Plains into the Southwest. Severe storms, including very large hail, strong tornadoes, and winds, are expected from the Great Lakes into the central/southern Plains. Heavy late-season snow and cold temperatures are expected in the northern to central Rockies. Heat is spreading across the eastern U.S.. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Clear

70°F

21°C

Humidity 16%
Wind Speed N 11 MPH
Barometer 29.84 in (1010.5 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 17 May 08:35 PM PDT
Extended Forecast for

4 Miles SE Saint Helena CA

Coastal Flood Advisory May 17, 08:52pm until May 19, 03:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory May 17, 08:52pm until May 19, 03:00am

    NOW until 3:00am Tue

    Coastal Flood Advisory

  • Tonight

    Low: 57 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86. North wind 7 to 13 mph, with gusts as high as 28 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. North wind around 5 mph becoming calm  in the evening.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. Calm wind becoming north northeast around 5 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 56. West wind around 5 mph becoming calm  in the evening.

    Low: 56 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 55.

    Low: 55 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 57. North northwest wind 9 to 11 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 86. North wind 7 to 13 mph, with gusts as high as 28 mph.
Monday Night
Mostly clear, with a low around 54. North wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 91. Calm wind becoming north northeast around 5 mph.
Tuesday Night
Clear, with a low around 56. West wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Clear, with a low around 55.
Thursday
Sunny, with a high near 93.
Thursday Night
Clear, with a low around 53.
Friday
Sunny, with a high near 86.
Friday Night
Patchy fog. Otherwise, mostly clear, with a low around 51.
Saturday
Patchy fog. Otherwise, sunny, with a high near 82.
Saturday Night
Patchy fog. Otherwise, mostly clear, with a low around 50.
Sunday
Mostly sunny, with a high near 82.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Saint Helena CA
 38.45°N 122.41°W (Elev. 157 ft)
8:42 pm PDT May 17, 2026
8pm PDT May 17, 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