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

48°F

9°C

Humidity 48%
Wind Speed W 5 mph
Barometer 29.84 in (1012.0 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 14 Mar 2:56 am EDT
Extended Forecast for

Olney MD

  • Overnight

    Overnight: Mostly clear, with a low around 41. West wind around 13 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 54. West wind 13 to 15 mph, with gusts as high as 26 mph.

    High: 54 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 38. Calm wind becoming east around 5 mph after midnight.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 57. Southeast wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 57 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers. Low around 52. Southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 52 °F

    Showers
    Likely then
    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 2pm. High near 69. Breezy. Chance of precipitation is 100%.

    High: 69 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Rain showers likely, mixing with snow after 11pm, then gradually ending. Mostly cloudy, with a low around 28. Breezy. Chance of precipitation is 70%.

    Low: 28 °F

    Rain/Snow
    Likely and
    Breezy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 41. West wind around 13 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 54. West wind 13 to 15 mph, with gusts as high as 26 mph.
Saturday Night
Mostly cloudy, with a low around 38. Calm wind becoming east around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 57. Southeast wind 8 to 16 mph, with gusts as high as 26 mph.
Sunday Night
Showers. Low around 52. Southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Monday
Showers, with thunderstorms also possible after 2pm. High near 69. Breezy. Chance of precipitation is 100%.
Monday Night
Rain showers likely, mixing with snow after 11pm, then gradually ending. Mostly cloudy, with a low around 28. Breezy. Chance of precipitation is 70%.
Tuesday
Mostly sunny, with a high near 35.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Partly sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 51.
Thursday Night
Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.09°W (Elev. 449 ft)
Last Update:
1:53 am EDT Mar 14, 2026
Forecast Valid:
3am EDT Mar 14, 2026-6pm EDT Mar 20, 2026
 
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