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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 >

Hazardous Weather Conditions

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

81°F

27°C

Humidity 72%
Wind Speed W 10 mph
Barometer 29.90 in (1012.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 17 Aug 6:53 pm EDT
Extended Forecast for

Williamsport MD

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 67. North wind 6 to 8 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Scattered
    Showers then
    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers after 2pm. Mostly cloudy, with a high near 79. North wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 79 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 65. Northeast wind 3 to 7 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. East wind around 6 mph. Chance of precipitation is 30%.

    High: 77 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers, mainly before 8pm. Mostly cloudy, with a low around 65. East wind 3 to 6 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.

    High: 82 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers before 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Tonight
Scattered showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 67. North wind 6 to 8 mph. Chance of precipitation is 30%.
Monday
A slight chance of showers after 2pm. Mostly cloudy, with a high near 79. North wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Monday Night
A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 65. Northeast wind 3 to 7 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. East wind around 6 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers, mainly before 8pm. Mostly cloudy, with a low around 65. East wind 3 to 6 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Wednesday Night
A chance of showers before 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
A chance of showers after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 64.
Saturday
A chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 87. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Williamsport MD
 39.59°N 77.83°W (Elev. 348 ft)
Last Update:
5:23 pm EDT Aug 17, 2025
Forecast Valid:
7pm EDT Aug 17, 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