National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall Continues in South Florida; Severe Thunderstorms in the Northern High Plains

A stalled front will continue to bring additional heavy to excessive rainfall across South Florida today into Saturday with localized and urban flooding possible. A corridor of strong to severe thunderstorms with hail and damaging wind gusts is forecast today from eastern Montana into western North Dakota. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Mostly Cloudy

74°F

23°C

Humidity 69%
Wind Speed Calm
Barometer 30.14 in (1021.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 11 Sep 4:56 pm EDT
Extended Forecast for

Olney MD

  • This Afternoon

    This Afternoon: A slight chance of showers. Partly sunny, with a high near 79. Northeast wind around 6 mph. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers before 9pm. Mostly clear, with a low around 55. Calm wind. Chance of precipitation is 20%.

    Low: 55 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. East wind around 6 mph.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 57. Light southeast wind.

    Low: 57 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82. Light southwest wind.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers. Partly sunny, with a high near 79. Northeast wind around 6 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers before 9pm. Mostly clear, with a low around 55. Calm wind. Chance of precipitation is 20%.
Friday
Sunny, with a high near 80. East wind around 6 mph.
Friday Night
Mostly clear, with a low around 57. Light southeast wind.
Saturday
Sunny, with a high near 82. Light southwest wind.
Saturday Night
Partly cloudy, with a low around 60.
Sunday
Sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Partly sunny, with a high near 77.
Tuesday Night
Mostly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
4:44 pm EDT Sep 11, 2025
Forecast Valid:
5pm EDT Sep 11, 2025-6pm EDT Sep 18, 2025
 
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