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

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

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

14°F

-10°C

Humidity 56%
Wind Speed Calm
Barometer 30.50 in (1035.4 mb)
Dewpoint 1°F (-17°C)
Visibility 10.00 mi
Last update 20 Jan 11:56 pm EST
Extended Forecast for

Derwood MD

  • Overnight

    Overnight: Mostly clear, with a low around 12. Calm wind.

    Low: 12 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. Light and variable wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 26 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 33. Southwest wind 9 to 11 mph.

    Low: 33 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 48. West wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 48 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 27. Northwest wind 3 to 7 mph.

    Low: 27 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of snow after 1pm. Mostly cloudy, with a high near 18. Chance of precipitation is 30%.

    High: 18 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Snow. Low around 13. Chance of precipitation is 80%.

    Low: 13 °F

    Snow

Detailed Forecast

Overnight
Mostly clear, with a low around 12. Calm wind.
Wednesday
Mostly sunny, with a high near 38. Light and variable wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 26 mph.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 33. Southwest wind 9 to 11 mph.
Thursday
Mostly sunny, with a high near 48. West wind 7 to 14 mph, with gusts as high as 23 mph.
Thursday Night
Partly cloudy, with a low around 27. Northwest wind 3 to 7 mph.
Friday
Mostly cloudy, with a high near 38.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
A chance of snow after 1pm. Mostly cloudy, with a high near 18. Chance of precipitation is 30%.
Saturday Night
Snow. Low around 13. Chance of precipitation is 80%.
Sunday
Snow. High near 18. Chance of precipitation is 90%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 12. Chance of precipitation is 50%.
Monday
Mostly sunny, with a high near 24.
Monday Night
Mostly clear, with a low around 6.
Tuesday
Sunny, with a high near 24.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Derwood MD
 39.12°N 77.13°W (Elev. 348 ft)
Last Update:
12:04 am EST Jan 21, 2026
Forecast Valid:
12am EST Jan 21, 2026-6pm EST Jan 27, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation