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.

Overcast

82°F

28°C

Humidity 90%
Wind Speed Calm
Barometer 30.13 in (1021.0 mb)
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 15 Aug 6:56 pm EDT
Extended Forecast for

Rossmoor MD

  • Tonight

    Tonight: Isolated showers and thunderstorms before 9pm. Patchy fog after 5am. Otherwise, increasing clouds, with a low around 71. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 71 °F

    Isolated
    T-storms then
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 88. Calm wind becoming east around 5 mph in the afternoon.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. Light south wind.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 71. Calm wind becoming northwest around 5 mph after midnight. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 20%.

    High: 86 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.

    Low: 65 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 9pm. Patchy fog after 5am. Otherwise, increasing clouds, with a low around 71. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Saturday
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 88. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 70. Light south wind.
Sunday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 71. Calm wind becoming northwest around 5 mph after midnight. Chance of precipitation is 20%.
Monday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 67.
Tuesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Rossmoor MD
 39.12°N 77.1°W (Elev. 348 ft)
Last Update:
4:29 pm EDT Aug 15, 2025
Forecast Valid:
7pm EDT Aug 15, 2025-6pm EDT Aug 22, 2025
 
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