Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Napa, Napa County Airport (KAPC)

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

Mist

43°F

6°C

Humidity 100%
Wind Speed NE 6 MPH
Barometer 30.12 in (1019.98 mb)
Dewpoint 43°F (6°C)
Visibility 6.00 mi
Wind Chill39°F (4°C)
Last update 19 Jan 11:20 PM PST
Extended Forecast for

4 Miles E Saint Helena CA

  • Tonight

    Tonight: Partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, then becoming cloudy during the afternoon, with a high near 63. Calm wind.

    High: 63 °F

    Becoming
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 62. Calm wind.

    High: 62 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Patchy fog.  Otherwise, partly cloudy, with a low around 43.

    Low: 43 °F

    Patchy Fog

  • Friday

    Friday: Areas of fog before 9am.  Otherwise, mostly sunny, with a high near 62.

    High: 62 °F

    Areas Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 42. Calm wind.
Tuesday
Mostly sunny, then becoming cloudy during the afternoon, with a high near 63. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 46. Calm wind.
Wednesday
Mostly cloudy, with a high near 62. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 46. Calm wind.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
Patchy fog. Otherwise, partly cloudy, with a low around 43.
Friday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 62.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 42.
Sunday
Partly sunny, with a high near 60.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Partly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Saint Helena CA
 38.5°N 122.4°W (Elev. 476 ft)
1:15 pm PST Jan 19, 2026
11pm PST Jan 19, 2026-6pm PST Jan 26, 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