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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

78°F

26°C

Humidity 100%
Wind Speed Calm
Barometer 30.17 in (1022.8 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 17 Sep 3:56 pm EDT
Extended Forecast for

4 Miles SW Glenwood MD

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind around 6 mph. Chance of precipitation is 40%.

    High: 83 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms before 10pm. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 40%.

    Low: 70 °F

    Scattered
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82. North wind 6 to 9 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. Northeast wind around 6 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 77. Northeast wind around 6 mph becoming southeast in the afternoon.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers after 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.

    Low: 65 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Monday

    Monday: A slight chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 73. Chance of precipitation is 40%.

    High: 73 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind around 6 mph. Chance of precipitation is 40%.
Tonight
Scattered showers and thunderstorms before 10pm. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 82. North wind 6 to 9 mph.
Friday Night
Partly cloudy, with a low around 59. Northeast wind around 6 mph.
Saturday
Mostly sunny, with a high near 77. Northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
A slight chance of showers after 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Monday
A slight chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 73. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.
Tuesday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 52. Chance of precipitation is 60%.
Wednesday
A chance of showers. Partly sunny, with a high near 60. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Glenwood MD
 39.25°N 77.08°W (Elev. 459 ft)
Last Update:
2:23 pm EDT Sep 17, 2026
Forecast Valid:
4pm EDT Sep 17, 2026-6pm EDT Sep 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