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

Showers and Thunderstorms for the Eastern Third of the Country; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

Showers and thunderstorms will continue along and ahead of a cold front for the eastern third of the country. The rainfall for the Great Lakes region could prolong the ongoing flooding. Much cooler weather will filter in behind this cold front along and east of the Rockies. Where the rain is needed, the Southern High Plains, critical fire weather concerns through this weekend. Read More >

Hazardous Weather Conditions

Current conditions at

Harrisburg, Harrisburg International Airport (KMDT)

Lat: 40.19°NLon: 76.76°WElev: 312ft.

Mostly Cloudy

52°F

11°C

Humidity 59%
Wind Speed NW 12 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 19 Apr 3:56 pm EDT
Extended Forecast for

Hallam PA

Freeze Watch April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Watch

  • Tonight

    Tonight: A slight chance of showers after 3am. Increasing clouds, with a low around 39. Northwest wind 6 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.

    Low: 39 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 50. Northwest wind around 14 mph, with gusts as high as 25 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29. Northwest wind 5 to 9 mph becoming light after midnight.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 44. South wind 8 to 10 mph. Chance of precipitation is 30%.

    Low: 44 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, mainly before 2pm. Partly sunny, with a high near 67. Chance of precipitation is 40%.

    High: 67 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers after 3am. Increasing clouds, with a low around 39. Northwest wind 6 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 50. Northwest wind around 14 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 29. Northwest wind 5 to 9 mph becoming light after midnight.
Tuesday
Sunny, with a high near 55. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tuesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 44. South wind 8 to 10 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers, mainly before 2pm. Partly sunny, with a high near 67. Chance of precipitation is 40%.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 73.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 75.
Friday Night
A chance of showers. Partly cloudy, with a low around 53. Chance of precipitation is 40%.
Saturday
Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Sunday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hallam PA
 40.02°N 76.6°W (Elev. 522 ft)
Last Update:
2:51 pm EDT Apr 19, 2026
Forecast Valid:
4pm EDT Apr 19, 2026-6pm EDT Apr 26, 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