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

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

59°F

15°C

Humidity 83%
Wind Speed NW 7 mph
Barometer 30.24 in (1024.6 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 29 Aug 6:53 am EDT
Extended Forecast for

Mercersburg PA

  • Today

    Today: Mostly sunny, with a high near 83. Light and variable wind.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers after 1pm. Mostly sunny, with a high near 89. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 89. Light and variable wind.

    High: 89 °F

    Partly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 20%.

    Low: 70 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny and hot, with a high near 92.

    High: 92 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers after 2pm. Mostly sunny and hot, with a high near 93. Chance of precipitation is 30%.

    High: 93 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 83. Light and variable wind.
Tonight
Partly cloudy, with a low around 65. Calm wind.
Sunday
A slight chance of showers after 1pm. Mostly sunny, with a high near 89. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 68. Calm wind.
Monday
Partly sunny, with a high near 89. Light and variable wind.
Monday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 20%.
Tuesday
Partly sunny and hot, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
A chance of showers after 2pm. Mostly sunny and hot, with a high near 93. Chance of precipitation is 30%.
Wednesday Night
A chance of showers before 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.
Thursday
A chance of showers. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mercersburg PA
 39.82°N 77.9°W (Elev. 600 ft)
Last Update:
6:10 am EDT Aug 29, 2026
Forecast Valid:
7am EDT Aug 29, 2026-6pm EDT Sep 4, 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