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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Partly Cloudy

70°F

21°C

Humidity NA
Wind Speed Calm
Barometer 30.01 in (1016.8 mb)
Dewpoint N/A
Visibility 8.00 mi
Last update 18 Aug 5:56 am EDT
Extended Forecast for

Clarksville MD

  • Today

    Today: A slight chance of showers between 11am and 3pm. Mostly cloudy, with a high near 73. Northeast wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    High: 73 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 64. East wind around 7 mph.

    Low: 64 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers before 2pm. Mostly cloudy, with a high near 73. East wind around 7 mph. Chance of precipitation is 20%.

    High: 73 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 65. East wind 3 to 6 mph.

    Low: 65 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers after 2pm. Partly sunny, with a high near 79. East wind around 6 mph. Chance of precipitation is 20%.

    High: 79 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers between 11am and 3pm. Mostly cloudy, with a high near 73. Northeast wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Tonight
Mostly cloudy, with a low around 64. East wind around 7 mph.
Tuesday
A slight chance of showers before 2pm. Mostly cloudy, with a high near 73. East wind around 7 mph. Chance of precipitation is 20%.
Tuesday Night
Mostly cloudy, with a low around 65. East wind 3 to 6 mph.
Wednesday
A slight chance of showers after 2pm. Partly sunny, with a high near 79. East wind around 6 mph. Chance of precipitation is 20%.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 66. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 84.
Saturday Night
A chance of showers. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Clarksville MD
 39.22°N 76.97°W (Elev. 551 ft)
Last Update:
4:29 am EDT Aug 18, 2025
Forecast Valid:
6am EDT Aug 18, 2025-6pm EDT Aug 24, 2025
 
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