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

Patuxent River, Naval Air Station (KNHK)

Lat: 38.28°NLon: 76.41°WElev: 39ft.

Fair

75°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 29.91 in (1013.0 mb)
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Last update 17 Aug 11:52 pm EDT
Extended Forecast for

Great Mills MD

  • Overnight

    Overnight: Isolated showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming light and variable. Chance of precipitation is 20%.

    Low: 72 °F

    Isolated
    T-storms

  • Monday

    Monday: A chance of showers after 2pm. Mostly cloudy, with a high near 81. Northeast wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

    High: 81 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly before 2am. Mostly cloudy, with a low around 68. Northeast wind 7 to 9 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, mainly between 8am and 2pm. Partly sunny, with a high near 78. East wind 8 to 10 mph. Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 68. East wind 5 to 7 mph.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Overnight
Isolated showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming light and variable. Chance of precipitation is 20%.
Monday
A chance of showers after 2pm. Mostly cloudy, with a high near 81. Northeast wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers, mainly before 2am. Mostly cloudy, with a low around 68. Northeast wind 7 to 9 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers, mainly between 8am and 2pm. Partly sunny, with a high near 78. East wind 8 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 68. East wind 5 to 7 mph.
Wednesday
A slight chance of showers after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 67.
Friday
Sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Great Mills MD
 38.27°N 76.5°W (Elev. 98 ft)
Last Update:
10:29 pm EDT Aug 17, 2025
Forecast Valid:
12am 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