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.

Partly Cloudy

85°F

29°C

Humidity 68%
Wind Speed Calm
Barometer 30.15 in (1021.8 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 16 Aug 12:56 pm EDT
Extended Forecast for

Olney MD

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 87. South wind 3 to 5 mph.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 70. Southeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 92. Calm wind becoming west around 5 mph in the afternoon.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 71. Calm wind becoming north 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. Partly sunny, with a high near 82. North wind around 7 mph. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.

    High: 83 °F

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 87. South wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 70. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 92. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 71. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 20%.
Monday
A slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. North wind around 7 mph. Chance of precipitation is 20%.
Monday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Tuesday
Partly sunny, with a high near 81.
Tuesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.
Wednesday Night
A chance of showers before 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Thursday
A chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
1:29 pm EDT Aug 16, 2025
Forecast Valid:
1pm EDT Aug 16, 2025-6pm EDT Aug 22, 2025
 
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