National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Great Lakes Snow through Friday; Watching Potential for Major Winter Storm Late Week into this Weekend

Heavy lake effect snow will continue in the Great Lakes into Wednesday before another storm brings a widespread general snow followed by another round of heavy lake effect snow. A wide-ranging winter storm will produce great swaths of heavy snow, sleet, and treacherous freezing rain from the southern Rockies/Plains and Mid-South starting Friday and shifting toward the East Coast through Sunday. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

28°F

-2°C

Humidity 24%
Wind Speed W 10 G 18 mph
Barometer 30.37 in (1030.7 mb)
Dewpoint -4°F (-20°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 20 Jan 2:56 pm EST
Extended Forecast for

Dayton MD

  • Tonight

    Tonight: Mostly clear, with a low around 12. West wind around 5 mph becoming calm in the evening.

    Low: 12 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 37. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 25 mph.

    High: 37 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 30. South wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 47. Southwest wind 7 to 13 mph, with gusts as high as 23 mph.

    High: 47 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. Northwest wind 3 to 6 mph.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 8.

    Low: 8 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of snow after 1pm. Mostly cloudy, with a high near 17. Chance of precipitation is 30%.

    High: 17 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Snow. Low around 12. Chance of precipitation is 80%.

    Low: 12 °F

    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 12. West wind around 5 mph becoming calm in the evening.
Wednesday
Increasing clouds, with a high near 37. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 25 mph.
Wednesday Night
Mostly cloudy, with a low around 30. South wind 8 to 10 mph, with gusts as high as 22 mph.
Thursday
Mostly sunny, with a high near 47. Southwest wind 7 to 13 mph, with gusts as high as 23 mph.
Thursday Night
Partly cloudy, with a low around 25. Northwest wind 3 to 6 mph.
Friday
Partly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 8.
Saturday
A chance of snow after 1pm. Mostly cloudy, with a high near 17. Chance of precipitation is 30%.
Saturday Night
Snow. Low around 12. Chance of precipitation is 80%.
Sunday
Snow. High near 19. Chance of precipitation is 80%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 8. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 22.
Monday Night
Partly cloudy, with a low around 7.
Tuesday
Mostly sunny, with a high near 24.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dayton MD
 39.24°N 76.99°W (Elev. 568 ft)
Last Update:
12:53 pm EST Jan 20, 2026
Forecast Valid:
3pm EST Jan 20, 2026-6pm EST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation