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

Hazardous Weather Conditions

Current conditions at

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Overcast

31°F

-1°C

Humidity 59%
Wind Speed SE 5 mph
Barometer 29.99 in (1015.9 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 17 Jan 1:56 am EST
Extended Forecast for

Hummelstown PA

Winter Weather Advisory January 17, 05:00am until January 17, 12:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: A slight chance of snow before 3am, then a chance of snow after 5am. Cloudy, with a low around 29. Southeast wind around 6 mph. Chance of precipitation is 30%.

    Low: 29 °F

    Chance Snow

  • Saturday

    Saturday: Snow, mainly before noon. The snow could be heavy at times. High near 43. South wind 6 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    High: 43 °F

    Heavy Snow
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 27. Calm wind.

    Low: 27 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A slight chance of snow before 1pm. Mostly cloudy, with a high near 33. West wind 3 to 8 mph. Chance of precipitation is 20%.

    High: 33 °F

    Slight Chance
    Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18. Northwest wind around 6 mph.

    Low: 18 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 11.

    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 10.

    Low: 10 °F

    Mostly Clear

Detailed Forecast

Overnight
A slight chance of snow before 3am, then a chance of snow after 5am. Cloudy, with a low around 29. Southeast wind around 6 mph. Chance of precipitation is 30%.
Saturday
Snow, mainly before noon. The snow could be heavy at times. High near 43. South wind 6 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Saturday Night
Increasing clouds, with a low around 27. Calm wind.
Sunday
A slight chance of snow before 1pm. Mostly cloudy, with a high near 33. West wind 3 to 8 mph. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 18. Northwest wind around 6 mph.
M.L.King Day
Mostly sunny, with a high near 34.
Monday Night
Partly cloudy, with a low around 11.
Tuesday
Sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 10.
Wednesday
Partly sunny, with a high near 35.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Mostly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hummelstown PA
 40.26°N 76.7°W (Elev. 427 ft)
Last Update:
1:26 am EST Jan 17, 2026
Forecast Valid:
2am EST Jan 17, 2026-6pm EST Jan 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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