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

Areas of Heavy Rainfall and Heat Early This Week

Excessive rainfall may produce locally considerable flash flooding over parts of South Texas, the western Gulf Coast, and lower Mississippi River Valley today into Thursday. Rainfall totals of 5 to 10 inches are expected. Hot temperatures may cause heat illnesses over central and northern California and the Pacific Northwest through Tuesday. Read More >

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Overcast

71°F

22°C

Humidity 49%
Wind Speed NW 15 mph
Barometer 29.84 in (1011.1 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 15 Jun 3:53 pm EDT
Extended Forecast for

3 Miles SSW Mercersburg PA

  • Tonight

    Tonight: Mostly clear, with a low around 52. Northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers after 2am. Partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 20%.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 90. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Juneteenth

    Juneteenth: A chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 40%.

    High: 78 °F

    Chance
    Showers

  • Friday Night

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

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 52. Northwest wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 58. Calm wind.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Wednesday Night
A slight chance of showers after 2am. Partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 20%.
Thursday
Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 90. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
Juneteenth
A chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 40%.
Friday Night
Mostly clear, with a low around 59.
Saturday
Sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
Monday
A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Mercersburg PA
 39.78°N 77.94°W (Elev. 551 ft)
Last Update:
2:46 pm EDT Jun 15, 2026
Forecast Valid:
4pm EDT Jun 15, 2026-6pm EDT Jun 22, 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