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

Hazardous Weather Conditions

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Overcast

80°F

27°C

Humidity 69%
Wind Speed S 10 mph
Barometer 29.94 in (1014.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 20 Aug 12:53 pm EDT
Extended Forecast for

Williamson PA

Flood Watch August 20, 01:35pm until August 20, 04:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch August 20, 01:35pm until August 20, 04:00pm

    NOW until 4:00pm Thu

    Flood Watch

  • This Afternoon

    High: 78 °F

    Rain

  • Tonight

    Tonight: A chance of rain and thunderstorms before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 62. North wind 3 to 6 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 81. Northeast wind 3 to 5 mph.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Patchy fog after 2am. Otherwise, increasing clouds, with a low around 65. Calm wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    Showers then
    Showers
    Likely and
    Patchy Fog

  • Saturday

    Saturday: Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Showers
    Likely and
    Patchy Fog

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 64. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Showers
    Likely then
    Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 82.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Rain and possibly a thunderstorm. High near 78. Southeast wind around 5 mph becoming calm. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
A chance of rain and thunderstorms before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 62. North wind 3 to 6 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Mostly sunny, with a high near 81. Northeast wind 3 to 5 mph.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Patchy fog after 2am. Otherwise, increasing clouds, with a low around 65. Calm wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 64. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 59.
Monday
Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 61.
Wednesday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Williamson PA
 39.86°N 77.81°W (Elev. 545 ft)
Last Update:
12:26 pm EDT Aug 20, 2026
Forecast Valid:
1pm EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
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