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

Harford County Airport (K0W3)

Lat: 39.57°NLon: 76.2°WElev: 412ft.

Fair

71°F

22°C

Humidity 100%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 18 Aug 12:15 am EDT
Extended Forecast for

Perryman MD

  • Overnight

    Overnight: Mostly cloudy, with a low around 69. North wind 3 to 5 mph.

    Low: 69 °F

    Mostly Cloudy

  • Monday

    Monday: Cloudy, with a high near 77. Northeast wind around 11 mph, with gusts as high as 21 mph.

    High: 77 °F

    Cloudy

  • Monday Night

    Monday Night: A chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 63. East wind around 6 mph. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 78. East wind around 7 mph.

    High: 78 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers before 2am. Mostly cloudy, with a low around 63. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    Showers

  • Wednesday

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

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

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

    Low: 64 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 69. North wind 3 to 5 mph.
Monday
Cloudy, with a high near 77. Northeast wind around 11 mph, with gusts as high as 21 mph.
Monday Night
A chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 63. East wind around 6 mph. Chance of precipitation is 30%.
Tuesday
Partly sunny, with a high near 78. East wind around 7 mph.
Tuesday Night
A slight chance of showers before 2am. Mostly cloudy, with a low around 63. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
A slight chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 63.
Friday
Mostly sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 65.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
A chance of showers. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
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:
Perryman MD
 39.47°N 76.2°W (Elev. 30 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