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

Critical Fire Weather in the Plains; Severe Thunderstorms in the Upper Mississippi Valley and Great Lakes

Anomalously warm, dry and breezy conditions will bring elevated to critical fire weather conditions across portions of the Intermountain West into the central and southern Plains today. Strong to severe thunderstorms are possible across portions of the upper Mississippi River Valley to the Great Lakes tonight through the day Tuesday. Damaging gusts, hail, and heavy rainfall are likely. Read More >

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Overcast

54°F

12°C

Humidity 47%
Wind Speed S 10 mph
Barometer 30.23 in (1024.8 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 30 Mar 8:53 am EDT
Extended Forecast for

3 Miles N Mercersburg PA

  • Today

    Today: A chance of showers, mainly between 3pm and 5pm. Partly sunny, with a high near 69. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 69 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of thunderstorms between 7pm and 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 54. South wind 3 to 6 mph. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, with thunderstorms also possible after 11am. Mostly sunny, with a high near 79. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 2am. Partly cloudy, with a low around 64. Southwest wind around 6 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southwest wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers. Partly sunny, with a high near 74. Chance of precipitation is 50%.

    High: 74 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.

    Low: 57 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.

    High: 79 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Today
A chance of showers, mainly between 3pm and 5pm. Partly sunny, with a high near 69. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of thunderstorms between 7pm and 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 54. South wind 3 to 6 mph. Chance of precipitation is 40%.
Tuesday
A slight chance of showers, with thunderstorms also possible after 11am. Mostly sunny, with a high near 79. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers after 2am. Partly cloudy, with a low around 64. Southwest wind around 6 mph. Chance of precipitation is 20%.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southwest wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers. Partly sunny, with a high near 74. Chance of precipitation is 50%.
Thursday Night
A chance of showers before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Friday
A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Friday Night
A chance of showers before 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
Saturday
A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 50%.
Sunday
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles N Mercersburg PA
 39.87°N 77.9°W (Elev. 564 ft)
Last Update:
10:12 am EDT Mar 30, 2026
Forecast Valid:
10am EDT Mar 30, 2026-6pm EDT Apr 5, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation