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Severe Thunderstorms and Heavy Rainfall; Typhoon Watch in Guam and CNMI

Heavy to excessive rainfall will continue through tonight from the Texas Big Bend region into southern Oklahoma. Scattered damaging wind gusts and a few tornadoes may accompany a line of severe thunderstorms that is expected across the Mid-Atlantic into New England Friday. A Typhoon Watch continues for Guam and CNMI as Tropical Storm Champi will strengthen and approach the islands this weekend. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

58°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.16 in (1022.6 mb)
Dewpoint 58°F (14°C)
Visibility 8.00 mi
Last update 15 Oct 8:56 pm EDT
Extended Forecast for

3 Miles NNW Great Falls VA

  • Tonight

    Tonight: A chance of showers, mainly before 4am. Cloudy, with a low around 58. Southeast wind around 7 mph. Chance of precipitation is 40%.

    Low: 58 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 5pm. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 9 to 11 mph. Chance of precipitation is 30%.

    High: 82 °F

    Patchy Fog
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 2am, then a chance of showers. Increasing clouds, with a low around 47. Northwest wind 14 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 54. Breezy, with a north wind 21 to 24 mph, with gusts as high as 37 mph.

    High: 54 °F

    Decreasing
    Clouds and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35. North wind 6 to 11 mph.

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers, mainly before 4am. Cloudy, with a low around 58. Southeast wind around 7 mph. Chance of precipitation is 40%.
Friday
A slight chance of showers before 8am, then a chance of showers and thunderstorms after 5pm. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 9 to 11 mph. Chance of precipitation is 30%.
Friday Night
Showers and thunderstorms likely before 2am, then a chance of showers. Increasing clouds, with a low around 47. Northwest wind 14 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 54. Breezy, with a north wind 21 to 24 mph, with gusts as high as 37 mph.
Saturday Night
Mostly clear, with a low around 35. North wind 6 to 11 mph.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Great Falls VA
 39.05°N 77.31°W (Elev. 200 ft)
Last Update:
7:53 pm EDT Oct 15, 2026
Forecast Valid:
9pm EDT Oct 15, 2026-6pm EDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

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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