Dangerous heat and humidity from the central U.S. to East Coast

Hot and very humid conditions will continue to produce heat index values over 100 degrees across a large portion of the central and eastern U.S. Heat Advisories and Excessive Heat Warnings continue for the Plains, Mississippi Valley, Midwest, Ohio Valley, Mid-Atlantic and southern states. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds

75°F

24°C

Humidity 83%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 25 Jul 2:15 am EDT
Extended Forecast for

Potomac MD

Heat Advisory July 25, 12:00pm until July 25, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Overnight

    Overnight: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 76. South wind 3 to 5 mph.  Chance of precipitation is 30%.

    Chance
    T-storms

    Low: 76 °F

  • Monday

    Monday: A slight chance of showers and thunderstorms after 2pm.  Partly sunny and hot, with a high near 98. Heat index values as high as 105. Light southwest wind becoming west 5 to 9 mph in the morning.  Chance of precipitation is 20%.

    Partly Sunny
    then Slight
    Chance
    T-storms

    High: 98 °F

  • Monday
    Night

    Monday Night: A chance of showers and thunderstorms before 5am.  Mostly cloudy, with a low around 76. West wind 5 to 7 mph.  Chance of precipitation is 50%.

    Chance
    T-storms

    Low: 76 °F

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, mainly after 2pm.  Partly sunny, with a high near 93. Northwest wind around 7 mph.  Chance of precipitation is 30%.

    Chance
    T-storms

    High: 93 °F

  • Tuesday
    Night

    Tuesday Night: A chance of showers and thunderstorms, mainly before 8pm.  Partly cloudy, with a low around 74. West wind around 5 mph becoming calm  after midnight.  Chance of precipitation is 30%.

    Chance
    T-storms

    Low: 74 °F

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms.  Mostly sunny, with a high near 93. Chance of precipitation is 20%.

    Slight Chance
    T-storms

    High: 93 °F

  • Wednesday
    Night

    Wednesday Night: Partly cloudy, with a low around 74.

    Partly Cloudy

    Low: 74 °F

  • Thursday

    Thursday: A chance of showers and thunderstorms.  Partly sunny, with a high near 93. Chance of precipitation is 30%.

    Chance
    T-storms

    High: 93 °F

  • Thursday
    Night

    Thursday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 76. Chance of precipitation is 30%.

    Chance
    T-storms

    Low: 76 °F

Detailed Forecast

Overnight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. South wind 3 to 5 mph. Chance of precipitation is 30%.
Monday
A slight chance of showers and thunderstorms after 2pm. Partly sunny and hot, with a high near 98. Heat index values as high as 105. Light southwest wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 20%.
Monday Night
A chance of showers and thunderstorms before 5am. Mostly cloudy, with a low around 76. West wind 5 to 7 mph. Chance of precipitation is 50%.
Tuesday
A chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 93. Northwest wind around 7 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 74. West wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 93. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 92. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 91. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 30%.
Click Map For Forecast
Point Forecast:
Potomac MD
 39.02°N 77.2°W (Elev. 381 ft)
1:28 am EDT Jul 25, 2016
2am EDT Jul 25, 2016-6pm EDT Jul 31, 2016
 
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Additional Resources

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Hourly Weather Forecast

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