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

Critical Fire Weather for a Large Part of the Central U.S.; Areas of Severe Thunderstorms

Gusty to high winds and low relative humidity will bring elevated to critical fire weather across large parts of the Great Plains and more localized parts of the Great Basin and central Rockies Thursday into Friday. Severe thunderstorms with large hail and damaging wind gusts are possible over the central Plains Thursday into this weekend. Read More >

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fog

51°F

11°C

Humidity 96%
Wind Speed Calm
Barometer 29.83 in (1011.0 mb)
Dewpoint 50°F (10°C)
Visibility 0.25 mi
Last update 14 May 12:53 am EDT
Extended Forecast for

Mercersburg PA

  • Overnight

    Overnight: Partly cloudy, with a low around 48. North wind 3 to 5 mph.

    Low: 48 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 60. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.

    High: 60 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 48. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 48 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 72. Northwest wind 8 to 11 mph, with gusts as high as 24 mph.

    High: 72 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers before 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 85.

    High: 85 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 48. North wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 60. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Thursday Night
Mostly cloudy, with a low around 48. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.
Friday
Mostly sunny, with a high near 72. Northwest wind 8 to 11 mph, with gusts as high as 24 mph.
Friday Night
Partly cloudy, with a low around 48. Calm wind.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
A chance of showers before 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.
Sunday
Partly sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 61.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny and hot, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 50%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mercersburg PA
 39.82°N 77.9°W (Elev. 600 ft)
Last Update:
1:21 am EDT May 14, 2026
Forecast Valid:
1am EDT May 14, 2026-6pm EDT May 20, 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