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.

Overcast

66°F

19°C

Humidity 78%
Wind Speed Vrbl 3 mph
Barometer 30.13 in (1021.2 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 19 Sep 2:56 am EDT
Extended Forecast for

Rockville MD

  • Overnight

    Overnight: Partly cloudy, with a low around 61. Northeast wind around 9 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. East wind around 6 mph.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers between 1am and 4am. Mostly cloudy, with a low around 64. East wind around 7 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, mainly between 2pm and 5pm. Mostly cloudy, with a high near 83. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 61. Light and variable wind becoming north 5 to 7 mph after midnight. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers, mainly after 2pm. Partly sunny, with a high near 70. Chance of precipitation is 30%.

    High: 70 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 40%.

    Low: 57 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.

    High: 63 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.

    Low: 53 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 61. Northeast wind around 9 mph.
Saturday
Partly sunny, with a high near 78. East wind around 6 mph.
Saturday Night
A slight chance of showers between 1am and 4am. Mostly cloudy, with a low around 64. East wind around 7 mph. Chance of precipitation is 20%.
Sunday
A chance of showers, mainly between 2pm and 5pm. Mostly cloudy, with a high near 83. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 61. Light and variable wind becoming north 5 to 7 mph after midnight. Chance of precipitation is 70%.
Monday
A chance of showers, mainly after 2pm. Partly sunny, with a high near 70. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 40%.
Tuesday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 60. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 54. 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 52. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 20%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rockville MD
 39.08°N 77.16°W (Elev. 430 ft)
Last Update:
2:22 am EDT Sep 19, 2026
Forecast Valid:
3am EDT Sep 19, 2026-6pm EDT Sep 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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