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

52°F

11°C

Humidity NA
Wind Speed SW 3 mph
Barometer 30.12 in (1021.4 mb)
Dewpoint N/A
Visibility 8.00 mi
Last update 9 Jan 8:56 pm EST
Extended Forecast for

Olney MD

  • Tonight

    Tonight: A chance of rain after 5am. Cloudy, with a low around 43. Southwest wind 5 to 7 mph becoming light and variable. Chance of precipitation is 30%.

    Low: 43 °F

    Cloudy then
    Chance Rain

  • Saturday

    Saturday: Rain, mainly before 4pm. High near 46. East wind 5 to 7 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 46 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly between 7pm and 1am. Cloudy, with a low around 37. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 37 °F

    Rain Likely

  • Sunday

    Sunday: A slight chance of rain and snow showers between 1pm and 2pm, then a slight chance of snow showers after 2pm. Mostly sunny, with a high near 43. Breezy, with a west wind 11 to 16 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 20%.

    High: 43 °F

    Mostly Sunny
    then Slight
    Chance
    Rain/Snow and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 28. Breezy, with a west wind 15 to 21 mph, with gusts as high as 28 mph.

    Low: 28 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A chance of rain after 5am. Cloudy, with a low around 43. Southwest wind 5 to 7 mph becoming light and variable. Chance of precipitation is 30%.
Saturday
Rain, mainly before 4pm. High near 46. East wind 5 to 7 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Rain likely, mainly between 7pm and 1am. Cloudy, with a low around 37. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
A slight chance of rain and snow showers between 1pm and 2pm, then a slight chance of snow showers after 2pm. Mostly sunny, with a high near 43. Breezy, with a west wind 11 to 16 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 28. Breezy, with a west wind 15 to 21 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 42.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Thursday
A chance of rain. Partly sunny, with a high near 38. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 34.
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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:
6:53 pm EST Jan 9, 2026
Forecast Valid:
9pm EST Jan 9, 2026-6pm EST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation