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

Severe Weather for Northeast Southeastward into the Southern Plains; Flooding in the Upper Great Lakes

Severe thunderstorms are expected from the Northeast to Texas through the night and for the Central/Southern Plains on Friday. Considerable flooding impacts are ongoing in the Upper Great Lakes, and expected to continue through the weekend. Fire weather concerns persist in the Plains and the mid-Atlantic. There is late-season snow over the Northern/Central Rockies and the Northern Plains. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Mostly Cloudy

68°F

20°C

Humidity 76%
Wind Speed Vrbl 3 mph
Barometer 29.86 in (1012.0 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 3:56 am EDT
Extended Forecast for

Olney MD

  • Overnight

    Overnight: Isolated showers before 5am. Mostly cloudy, with a low around 66. Northwest wind around 7 mph. Chance of precipitation is 20%.

    Low: 66 °F

    Isolated
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 79. Northwest wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. Northeast wind around 6 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 85. Southeast wind 7 to 13 mph, with gusts as high as 21 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 48. Southeast wind 5 to 11 mph. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers, mainly before 2pm. High near 60. Chance of precipitation is 80%.

    High: 60 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Mostly clear, with a low around 39. Chance of precipitation is 30%.

    Low: 39 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

Detailed Forecast

Overnight
Isolated showers before 5am. Mostly cloudy, with a low around 66. Northwest wind around 7 mph. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 79. Northwest wind 7 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 58. Northeast wind around 6 mph.
Saturday
Mostly sunny, with a high near 85. Southeast wind 7 to 13 mph, with gusts as high as 21 mph.
Saturday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 48. Southeast wind 5 to 11 mph. Chance of precipitation is 60%.
Sunday
Showers, mainly before 2pm. High near 60. Chance of precipitation is 80%.
Sunday Night
A chance of showers before 8pm. Mostly clear, with a low around 39. Chance of precipitation is 30%.
Monday
Sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Sunny, with a high near 75.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
3:33 am EDT Apr 17, 2026
Forecast Valid:
4am EDT Apr 17, 2026-6pm EDT Apr 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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