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

Lowell to Impact Hawaii; Heat Persists in the South-Central U.S.

Hurricane Lowell is forecast to pass west of Kauai`s coastal waters tonight. Impacts such as high surf and heavy rain could impact all of the islands. Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley into this week with limited nighttime relief. Periods of moderate to heavy rainfall will be possible through Tuesday morning in the northern Rockies. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

80°F

27°C

Humidity 38%
Wind Speed NE 5 mph
Barometer 30.17 in (1022.7 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 7 Sep 3:56 pm EDT
Extended Forecast for

Rockville MD

  • Tonight

    Tonight: Mostly clear, with a low around 59. North wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. South wind around 5 mph.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 70. Southwest wind around 9 mph, with gusts as high as 21 mph.

    Low: 70 °F

    Mostly Clear

  • Thursday

    Thursday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 50%.

    High: 87 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 59. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 63. South wind around 5 mph.
Wednesday
Sunny, with a high near 87. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 70. Southwest wind around 9 mph, with gusts as high as 21 mph.
Thursday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 64.
Saturday
A chance of showers, mainly after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Sunday
A slight chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rockville MD
 39.08°N 77.16°W (Elev. 430 ft)
Last Update:
3:26 pm EDT Sep 7, 2026
Forecast Valid:
4pm EDT Sep 7, 2026-6pm EDT Sep 14, 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