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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Gaithersburg MD

  • Overnight

    Overnight: Cloudy, with a low around 67. South wind around 8 mph.

    Low: 67 °F

    Cloudy

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 82. South wind 9 to 11 mph. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 62. Light and variable wind becoming north 5 to 7 mph after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 62 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 72. Northeast wind around 10 mph. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Cloudy, with a low around 59. Northeast wind around 8 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 66. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Cloudy, with a low around 54. Chance of precipitation is 50%.

    Low: 54 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 40%.

    High: 61 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Overnight
Cloudy, with a low around 67. South wind around 8 mph.
Sunday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 82. South wind 9 to 11 mph. Chance of precipitation is 50%.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 62. Light and variable wind becoming north 5 to 7 mph after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 72. Northeast wind around 10 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers. Cloudy, with a low around 59. Northeast wind around 8 mph. Chance of precipitation is 50%.
Tuesday
Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 66. Chance of precipitation is 60%.
Tuesday Night
A chance of showers and thunderstorms. Cloudy, with a low around 54. Chance of precipitation is 50%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Thursday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 62. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 30%.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Saturday
A slight chance of showers. Mostly sunny, with a high near 70. 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:
10:54 pm EDT Sep 19, 2026
Forecast Valid:
1am EDT Sep 20, 2026-6pm EDT Sep 26, 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