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

69°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 30.12 in (1021.0 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 15 Aug 4:56 am EDT
Extended Forecast for

Olney MDSimilar City Names

  • Today

    Today: Increasing clouds, with a high near 86. North wind around 5 mph becoming calm in the morning.

    High: 86 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 70. Light southeast wind. Chance of precipitation is 30%.

    Low: 70 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. High near 82. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 82 °F

    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely. Cloudy, then gradually becoming partly cloudy, with a low around 71. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 71 °F

    T-storms
    Likely then
    Showers
    Likely

  • Monday

    Monday: Mostly sunny, with a high near 87. Northwest wind 7 to 9 mph, with gusts as high as 18 mph.

    High: 87 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 86. North wind around 5 mph becoming calm in the morning.
Tonight
A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 70. Light southeast wind. Chance of precipitation is 30%.
Sunday
Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. High near 82. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Sunday Night
Showers and thunderstorms likely. Cloudy, then gradually becoming partly cloudy, with a low around 71. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Mostly sunny, with a high near 87. Northwest wind 7 to 9 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 68.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 87.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 70. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Friday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MDSimilar City Names
 39.14°N 77.1°W (Elev. 449 ft)
Last Update:
4:54 am EDT Aug 15, 2026
Forecast Valid:
5am EDT Aug 15, 2026-6pm EDT Aug 21, 2026
 
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Additional Resources

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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