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

41°F

5°C

Humidity 100%
Wind Speed S 8 mph
Barometer 30.25 in (1025.9 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 9 Jan 3:56 am EST
Extended Forecast for

Derwood MD

  • Overnight

    Overnight: Partly cloudy, with a low around 37. South wind around 6 mph.

    Low: 37 °F

    Partly Cloudy

  • Friday

    Friday: Rain likely, mainly after 4pm. Increasing clouds, with a high near 55. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Partly Sunny
    then Rain
    Likely

  • Friday Night

    Friday Night: A chance of rain before 8pm, then a slight chance of rain after 5am. Patchy fog before 8pm. Otherwise, cloudy, with a low around 45. Southwest wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 50%.

    Low: 45 °F

    Chance Rain
    and Patchy
    Fog then
    Cloudy

  • Saturday

    Saturday: Rain, mainly after 7am. High near 49. East wind 3 to 6 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 49 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before 1am. Cloudy, with a low around 40. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 70%.

    Low: 40 °F

    Rain Likely

  • Sunday

    Sunday: A slight chance of rain. Mostly sunny, with a high near 44. Chance of precipitation is 20%.

    High: 44 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 37. South wind around 6 mph.
Friday
Rain likely, mainly after 4pm. Increasing clouds, with a high near 55. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of rain before 8pm, then a slight chance of rain after 5am. Patchy fog before 8pm. Otherwise, cloudy, with a low around 45. Southwest wind 5 to 9 mph becoming light and variable after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 50%.
Saturday
Rain, mainly after 7am. High near 49. East wind 3 to 6 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Rain likely, mainly before 1am. Cloudy, with a low around 40. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 70%.
Sunday
A slight chance of rain. Mostly sunny, with a high near 44. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 29.
Monday
Sunny, with a high near 42.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 48.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Derwood MD
 39.14°N 77.12°W (Elev. 400 ft)
Last Update:
3:53 am EST Jan 9, 2026
Forecast Valid:
3am EST Jan 9, 2026-6pm EST Jan 15, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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