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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

72°F

22°C

Humidity NA
Wind Speed Calm
Barometer 29.93 in (1014.4 mb)
Dewpoint N/A
Visibility 7.00 mi
Last update 17 Aug 9:56 pm EDT
Extended Forecast for

3 Miles NE Great Falls VA

  • Tonight

    Tonight: Isolated showers and thunderstorms before 11pm. Mostly cloudy, with a low around 69. Light northwest wind. Chance of precipitation is 20%.

    Low: 69 °F

    Isolated
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: A chance of showers, mainly between 2pm and 5pm. Cloudy, with a high near 77. Northeast wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

    High: 77 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 65. East wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers. Mostly cloudy, with a high near 77. East wind around 6 mph. Chance of precipitation is 30%.

    High: 77 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers before 2am. Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 11pm. Mostly cloudy, with a low around 69. Light northwest wind. Chance of precipitation is 20%.
Monday
A chance of showers, mainly between 2pm and 5pm. Cloudy, with a high near 77. Northeast wind around 9 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 65. East wind 5 to 7 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 77. East wind around 6 mph. Chance of precipitation is 30%.
Tuesday Night
A slight chance of showers before 2am. Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Wednesday
A slight chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
A chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NE Great Falls VA
 39.05°N 77.26°W (Elev. 220 ft)
Last Update:
8:16 pm EDT Aug 17, 2025
Forecast Valid:
10pm EDT Aug 17, 2025-6pm EDT Aug 24, 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