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

Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Hagerstown, Washington County Regional Airport (KHGR)

Lat: 39.71°NLon: 77.73°WElev: 702ft.

Fair

82°F

28°C

Humidity 58%
Wind Speed S 5 mph
Barometer 30.03 in (1017.1 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 4 Jul 8:53 am EDT
Extended Forecast for

Williamsport MD

Extreme Heat Warning July 4, 10:00am until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Independence Day

    Independence Day: Scattered showers and thunderstorms after 3pm. Some of the storms could be severe. Increasing clouds and hot, with a high near 99. Heat index values as high as 110. West wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 99 °F

    Sunny then
    Severe
    Thunderstorms

  • Tonight

    Tonight: Scattered showers and thunderstorms before 1am, then scattered showers between 1am and 2am. Some of the storms could be severe. Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 72 °F

    Severe
    Thunderstorms
    then
    Scattered
    Showers

  • Sunday

    Sunday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. Patchy fog before 7am. High near 91. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 91 °F

    Patchy Fog
    then T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 5am, then a chance of showers. Low around 69. Light and variable wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 69 °F

    Showers

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 11am. High near 84. Southeast wind 3 to 5 mph. Chance of precipitation is 90%.

    High: 84 °F

    Showers
    Likely then
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 67. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 83. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, mainly after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

Detailed Forecast

Independence Day
Scattered showers and thunderstorms after 3pm. Some of the storms could be severe. Increasing clouds and hot, with a high near 99. Heat index values as high as 110. West wind 3 to 8 mph. Chance of precipitation is 30%.
Tonight
Scattered showers and thunderstorms before 1am, then scattered showers between 1am and 2am. Some of the storms could be severe. Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Sunday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. Patchy fog before 7am. High near 91. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers and thunderstorms before 5am, then a chance of showers. Low around 69. Light and variable wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 84. Southeast wind 3 to 5 mph. Chance of precipitation is 90%.
Monday Night
Showers and possibly a thunderstorm. Low around 67. Chance of precipitation is 80%.
Tuesday
A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Wednesday
A chance of showers, mainly after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Wednesday Night
A chance of showers, mainly before 8pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 90. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Williamsport MD
 39.61°N 77.8°W (Elev. 456 ft)
Last Update:
9:27 am EDT Jul 4, 2026
Forecast Valid:
9am EDT Jul 4, 2026-6pm EDT Jul 10, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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