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 >

Current conditions at

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

Fair

74°F

23°C

Humidity 56%
Wind Speed SE 18 G 24 mph
Barometer 29.84 in (1010.4 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 18 Apr 4:56 pm EDT
Extended Forecast for

Duncannon PA

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

    Tonight: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 46. East wind 5 to 14 mph, with gusts as high as 24 mph.  Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers, mainly before 9am.  High near 55. Northwest wind 11 to 14 mph, with gusts as high as 28 mph.  Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Showers then
    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers.  Partly cloudy, with a low around 38. West wind 3 to 6 mph.  Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 48. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 29. Northwest wind around 6 mph becoming calm  in the evening.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 2am.  Partly cloudy, with a low around 42. Chance of precipitation is 30%.

    Low: 42 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 8am.  Partly sunny, with a high near 68. Chance of precipitation is 30%.

    High: 68 °F

    Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 46. East wind 5 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Showers, mainly before 9am. High near 55. Northwest wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 38. West wind 3 to 6 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 48. Northwest wind 8 to 11 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 29. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 57.
Tuesday Night
A chance of showers after 2am. Partly cloudy, with a low around 42. Chance of precipitation is 30%.
Wednesday
A chance of showers before 8am. Partly sunny, with a high near 68. Chance of precipitation is 30%.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
Sunny, with a high near 73.
Thursday Night
Mostly clear, with a low around 50.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 53.
Saturday
A chance of showers. Partly sunny, with a high near 70. Chance of precipitation is 50%.
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ABOUT THIS FORECAST

 
Point Forecast:
Duncannon PA
 40.4°N 77.02°W (Elev. 413 ft)
5:21 pm EDT Apr 18, 2026
5pm EDT Apr 18, 2026-6pm EDT Apr 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database