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

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

28°C

82°F

Humidity 94%
Wind Speed SE 11 km/h
Barometer 1019.9 mb (30.10 in)
Dewpoint 27°C (80°F)
Visibility 16 km
Heat Index34°C (93°F)
Last update 13 Jul 9:56 am EDT
Extended Forecast for

Derwood MD

  • Today

    Today: A chance of showers and thunderstorms, mainly between noon and 2pm. Partly sunny, with a high near 31. Southeast wind 8 to 10 km/h. Chance of precipitation is 30%.

    High: 31 °C

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 23. South wind 3 to 8 km/h. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    Low: 23 °C

    Heavy Rain
    then Chance
    T-storms

  • Monday

    Monday: A chance of showers, then showers and thunderstorms likely after 11am. Mostly cloudy, with a high near 32. Calm wind. Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.

    High: 32 °C

    Chance
    T-storms then
    T-storms
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 5am, then a chance of showers. Mostly cloudy, with a low around 23. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    Low: 23 °C

    T-storms
    Likely

  • Tuesday

    Tuesday: A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 31. Calm wind becoming south 5 to 8 km/h in the afternoon. Chance of precipitation is 70%.

    High: 31 °C

    Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.

    Low: 23 °C

    Showers
    Likely then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 32. Chance of precipitation is 60%.

    High: 32 °C

    Partly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.

    Low: 23 °C

    Showers
    Likely then
    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 33. Chance of precipitation is 60%.

    High: 33 °C

    Partly Sunny
    then Showers
    Likely

Detailed Forecast

Today
A chance of showers and thunderstorms, mainly between noon and 2pm. Partly sunny, with a high near 31. Southeast wind 8 to 10 km/h. Chance of precipitation is 30%.
Tonight
Showers and thunderstorms likely before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 23. South wind 3 to 8 km/h. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Monday
A chance of showers, then showers and thunderstorms likely after 11am. Mostly cloudy, with a high near 32. Calm wind. Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.
Monday Night
Showers and thunderstorms likely before 5am, then a chance of showers. Mostly cloudy, with a low around 23. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Tuesday
A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 31. Calm wind becoming south 5 to 8 km/h in the afternoon. Chance of precipitation is 70%.
Tuesday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 32. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.
Thursday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 33. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 32. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 22. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 31. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Derwood MD
 39.12°N 77.13°W (Elev. 348 m)
Last Update:
10:30 am EDT Jul 13, 2025
Forecast Valid:
10am EDT Jul 13, 2025-6pm EDT Jul 19, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation