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 Rain

55°F

13°C

Humidity 83%
Wind Speed Calm
Barometer 29.78 in (1008.7 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 20 Mar 7:56 pm EDT
Extended Forecast for

Hallam PA

  • Tonight

    Tonight: Showers and thunderstorms likely before 10pm, then a slight chance of showers between 10pm and 2am. Mostly cloudy, with a low around 47. Southwest wind 7 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 56. North wind 6 to 9 mph.

    High: 56 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 44. Calm wind becoming south around 6 mph in the evening.

    Low: 44 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 72. Southwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 72 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 45. Southwest wind 9 to 11 mph becoming north after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 45 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely before 10pm, then a slight chance of showers between 10pm and 2am. Mostly cloudy, with a low around 47. Southwest wind 7 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 56. North wind 6 to 9 mph.
Saturday Night
Mostly cloudy, with a low around 44. Calm wind becoming south around 6 mph in the evening.
Sunday
A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 72. Southwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 45. Southwest wind 9 to 11 mph becoming north after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 53. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 48.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Partly sunny, with a high near 56.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 41. Chance of precipitation is 50%.
Friday
A chance of showers. Partly sunny, with a high near 53. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Hallam PA
 40.02°N 76.6°W (Elev. 522 ft)
Last Update:
6:46 pm EDT Mar 20, 2026
Forecast Valid:
8pm EDT Mar 20, 2026-6pm EDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation