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

Tropical Moisture Will Bring Heavy to Excessive Rainfall with Possible Flooding This Week

Tropical moisture from the remnants of Odalys and Hurricane Polo will surge over the southwest into the central U.S. this week with several days of heavy to excessive rainfall which may bring limited to considerable flooding. Flood Watches have been issued through Wednesday in the southwest U.S. and moderate risk outlooks have been issued today through Thursday. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

64°F

18°C

Humidity 87%
Wind Speed NW 5 mph
Barometer 29.97 in (1016.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 28 Sep 7:56 pm EDT
Extended Forecast for

Gaithersburg MD

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61. Light southeast wind.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers, mainly before 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. Calm wind.
Tuesday
Mostly sunny, with a high near 75. Calm wind becoming northwest around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 59. Calm wind.
Wednesday
Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 61. Light southeast wind.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 64.
Friday
Mostly sunny, with a high near 85.
Friday Night
A chance of showers, mainly before 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
Saturday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Partly sunny, with a high near 70. Chance of precipitation is 20%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.
Sunday
A chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 50%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.
Monday
A slight chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gaithersburg MD
 39.13°N 77.21°W (Elev. 404 ft)
Last Update:
7:53 pm EDT Sep 28, 2026
Forecast Valid:
8pm EDT Sep 28, 2026-6pm EDT Oct 5, 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