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

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Overcast

27°F

-3°C

Humidity 63%
Wind Speed N 9 mph
Barometer 29.93 in (1013.9 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 18 Jan 4:56 pm EST
Extended Forecast for

Hummelstown PA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 18. West wind 3 to 7 mph.

    Low: 18 °F

    Decreasing
    Clouds

  • M.L.King Day

    M.L.King Day: Increasing clouds, with a high near 34. West wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 34 mph.

    High: 34 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 11. Wind chill values as low as zero. West wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 11 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 22. Wind chill values as low as zero. West wind 10 to 14 mph, with gusts as high as 28 mph.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 8. West wind around 6 mph becoming calm in the evening.

    Low: 8 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 18. West wind 3 to 7 mph.
M.L.King Day
Increasing clouds, with a high near 34. West wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 34 mph.
Monday Night
Mostly clear, with a low around 11. Wind chill values as low as zero. West wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday
Sunny, with a high near 22. Wind chill values as low as zero. West wind 10 to 14 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly clear, with a low around 8. West wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 33.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Mostly sunny, with a high near 31.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
A chance of snow showers. Partly sunny, with a high near 28. Chance of precipitation is 30%.
Saturday Night
A chance of snow showers. Mostly cloudy, with a low around 12. Chance of precipitation is 30%.
Sunday
A chance of snow showers. Partly sunny, with a high near 21. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hummelstown PA
 40.26°N 76.7°W (Elev. 427 ft)
Last Update:
1:39 pm EST Jan 18, 2026
Forecast Valid:
5pm EST Jan 18, 2026-6pm EST Jan 25, 2026
 
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Additional Resources

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Chance of Precipitation