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

Severe Thunderstorms and Heavy Rainfall in the Ohio Valley and Great Lakes; Winter Weather in the Northern Tier

A slow moving front extending from the Great Lakes region into the Plains will bring snow, wintry mix, and ice accumulation north of the front from the Upper Midwest into New England, and severe weather and heavy rain south of the front. Scattered severe thunderstorms with damaging gusts, severe hail, and heavy rain are expected across parts of the Great Lakes/Midwest through tonight. Read More >

Hazardous Weather Conditions

Current conditions at

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Mostly Cloudy

77°F

25°C

Humidity 45%
Wind Speed S 12 G 26 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 31 Mar 2:56 pm EDT
Extended Forecast for

Hallam PA

  • This Afternoon

    This Afternoon: A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 78. Southwest wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    High: 78 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 63. Southwest wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 75. Southwest wind 8 to 10 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers. Patchy fog after 2am. Otherwise, cloudy, with a low around 49. Northeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A chance of showers, mainly after 2pm. Patchy fog before 11am. Otherwise, cloudy, with a high near 55. East wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Mostly cloudy, with a low around 50. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 40%.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 78. Southwest wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 63. Southwest wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 75. Southwest wind 8 to 10 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 slight chance of showers. Patchy fog after 2am. Otherwise, cloudy, with a low around 49. Northeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, mainly after 2pm. Patchy fog before 11am. Otherwise, cloudy, with a high near 55. East wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A chance of showers before 8pm. Mostly cloudy, with a low around 50. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 77.
Friday Night
Mostly cloudy, with a low around 60.
Saturday
A chance of showers after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 40%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.
Sunday
Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 70%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 38. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 54.
Monday Night
Mostly clear, with a low around 35.
Tuesday
Mostly sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hallam PA
 40.02°N 76.6°W (Elev. 522 ft)
Last Update:
2:21 pm EDT Mar 31, 2026
Forecast Valid:
3pm EDT Mar 31, 2026-6pm EDT Apr 7, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation