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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.

Partly Cloudy

75°F

24°C

Humidity 94%
Wind Speed NW 7 mph
Barometer 29.92 in (1013.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 18 Aug 5:52 am EDT
Extended Forecast for

Mechanicsville MD

  • Today

    Today: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 78. Northeast wind 5 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers, mainly between 4am and 5am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 67. Northeast wind 7 to 9 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: A chance of showers, mainly between 7am and 2pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. Northeast wind around 9 mph. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 67. East wind around 6 mph.

    Low: 67 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers after 2pm. Mostly sunny, with a high near 83. East wind around 7 mph. Chance of precipitation is 20%.

    High: 83 °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 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 78. Northeast wind 5 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Tonight
A chance of showers, mainly between 4am and 5am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 67. Northeast wind 7 to 9 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers, mainly between 7am and 2pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. Northeast wind around 9 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 67. East wind around 6 mph.
Wednesday
A slight chance of showers after 2pm. Mostly sunny, with a high near 83. East wind around 7 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 66.
Friday
Mostly sunny, with a high near 83.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 84.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
A chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mechanicsville MD
 38.43°N 76.73°W (Elev. 148 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