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

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

34°F

1°C

Humidity 56%
Wind Speed Calm
Barometer 30.15 in (1022.9 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Last update 12 Jan 8:56 pm EST
Extended Forecast for

Derwood MD

  • Tonight

    Tonight: Mostly clear, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. Calm wind becoming south 5 to 9 mph in the morning.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39. Southwest wind 6 to 10 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain. Cloudy, with a high near 50. Southwest wind around 6 mph. Chance of precipitation is 40%.

    High: 50 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 1am, then rain and snow likely. Mostly cloudy, with a low around 27. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 27 °F

    Rain Likely
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: Snow likely, mainly before 7am. Partly sunny, with a high near 33. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 33 °F

    Snow Likely
    then Chance
    Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 29. Calm wind.
Tuesday
Mostly sunny, with a high near 48. Calm wind becoming south 5 to 9 mph in the morning.
Tuesday Night
Mostly cloudy, with a low around 39. Southwest wind 6 to 10 mph.
Wednesday
A chance of rain. Cloudy, with a high near 50. Southwest wind around 6 mph. Chance of precipitation is 40%.
Wednesday Night
Rain likely before 1am, then rain and snow likely. Mostly cloudy, with a low around 27. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Thursday
Snow likely, mainly before 7am. Partly sunny, with a high near 33. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday Night
Partly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Partly sunny, with a high near 32.
Sunday Night
Partly cloudy, with a low around 15.
M.L.King Day
Mostly sunny, with a high near 30.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Derwood MD
 39.14°N 77.12°W (Elev. 400 ft)
Last Update:
8:32 pm EST Jan 12, 2026
Forecast Valid:
9pm EST Jan 12, 2026-6pm EST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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