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

24°F

-4°C

Humidity 60%
Wind Speed Vrbl 7 mph
Barometer 30.31 in (1028.6 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 18 Mar 2:56 am EDT
Extended Forecast for

Olney MD

  • Overnight

    Overnight: Partly cloudy, with a low around 26. Northwest wind around 5 mph.

    Low: 26 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 40. Calm wind becoming south around 6 mph in the afternoon.

    High: 40 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30. Light south wind.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 51. South wind 3 to 7 mph.

    High: 51 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 37. Light and variable wind.

    Low: 37 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of rain after 2pm. Partly sunny, with a high near 59. Chance of precipitation is 20%.

    High: 59 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Friday Night

    Friday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.

    Low: 46 °F

    Rain Likely

  • Saturday

    Saturday: Rain likely before 8am. Mostly sunny, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Rain Likely
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 26. Northwest wind around 5 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 40. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 30. Light south wind.
Thursday
Mostly sunny, with a high near 51. South wind 3 to 7 mph.
Thursday Night
Mostly cloudy, with a low around 37. Light and variable wind.
Friday
A slight chance of rain after 2pm. Partly sunny, with a high near 59. Chance of precipitation is 20%.
Friday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Saturday
Rain likely before 8am. Mostly sunny, with a high near 65. Chance of precipitation is 60%.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
A chance of rain after 2pm. Partly sunny, with a high near 70. Chance of precipitation is 30%.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 43. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 54.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 48.
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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:
2:24 am EDT Mar 18, 2026
Forecast Valid:
3am EDT Mar 18, 2026-6pm EDT Mar 24, 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