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.

Mostly Cloudy

61°F

16°C

Humidity 90%
Wind Speed Calm
Barometer 30.16 in (1022.3 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 19 Sep 6:56 am EDT
Extended Forecast for

Dayton MDSimilar City Names

  • Today

    Today: Partly sunny, with a high near 77. Northeast wind 5 to 8 mph becoming east in the afternoon.

    High: 77 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of showers before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 63. East wind 6 to 8 mph. Chance of precipitation is 20%.

    Low: 63 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers between 1pm and 5pm. Mostly cloudy, with a high near 81. South wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 11pm, then showers likely between 11pm and 2am. Mostly cloudy, with a low around 59. Light and variable wind becoming north 5 to 9 mph after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 59 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers after 8am. Partly sunny, with a high near 69. Northeast wind 8 to 10 mph. Chance of precipitation is 30%.

    High: 69 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.

    High: 62 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 40%.

    Low: 51 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Mostly cloudy, with a high near 59. Chance of precipitation is 40%.

    High: 59 °F

    Chance
    Showers

Detailed Forecast

Today
Partly sunny, with a high near 77. Northeast wind 5 to 8 mph becoming east in the afternoon.
Tonight
A slight chance of showers before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 63. East wind 6 to 8 mph. Chance of precipitation is 20%.
Sunday
A chance of showers between 1pm and 5pm. Mostly cloudy, with a high near 81. South wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.
Sunday Night
Showers and thunderstorms likely before 11pm, then showers likely between 11pm and 2am. Mostly cloudy, with a low around 59. Light and variable wind becoming north 5 to 9 mph after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers after 8am. Partly sunny, with a high near 69. Northeast wind 8 to 10 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.
Tuesday
Showers likely. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 40%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 59. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 65. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Dayton MDSimilar City Names
 39.24°N 76.99°W (Elev. 568 ft)
Last Update:
4:52 am EDT Sep 19, 2026
Forecast Valid:
7am EDT Sep 19, 2026-6pm EDT Sep 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation