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.

Light Snow Fog/Mist

30°F

-1°C

Humidity 92%
Wind Speed Calm
Barometer 30.05 in (1018.0 mb)
Dewpoint 28°F (-2°C)
Visibility 4.00 mi
Last update 18 Jan 1:56 am EST
Extended Forecast for

Hummelstown PA

  • Overnight

    Overnight: Snow likely, mainly after 5am. Cloudy, with a low around 27. Calm wind. Chance of precipitation is 60%. Total nighttime snow accumulation of around an inch possible.

    Low: 27 °F

    Snow Likely

  • Sunday

    Sunday: Snow likely, mainly before 9am. Cloudy, with a high near 35. Calm wind becoming northwest 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 35 °F

    Snow Likely
    then Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 18. West wind 5 to 7 mph.

    Low: 18 °F

    Decreasing
    Clouds

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 33. West wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 11. West wind 13 to 16 mph, with gusts as high as 28 mph.

    Low: 11 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 22.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Snow likely, mainly after 5am. Cloudy, with a low around 27. Calm wind. Chance of precipitation is 60%. Total nighttime snow accumulation of around an inch possible.
Sunday
Snow likely, mainly before 9am. Cloudy, with a high near 35. Calm wind becoming northwest 5 to 9 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 18. West wind 5 to 7 mph.
M.L.King Day
Mostly sunny, with a high near 33. West wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.
Monday Night
Partly cloudy, with a low around 11. West wind 13 to 16 mph, with gusts as high as 28 mph.
Tuesday
Sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 9.
Wednesday
Partly sunny, with a high near 32.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly clear, with a low around 16.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 35. Chance of precipitation is 30%.
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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:
1:36 am EST Jan 18, 2026
Forecast Valid:
2am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation