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 >

Current conditions at

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

Mostly Cloudy

60°F

16°C

Humidity 86%
Wind Speed E 8 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 18 Apr 7:56 am EDT
Extended Forecast for

Duncannon PA

  • Today

    Today: Partly sunny, with a high near 77. Southeast wind 6 to 11 mph, with gusts as high as 23 mph.

    High: 77 °F

    Partly Sunny

  • Tonight

    Tonight: Showers. Low around 46. Southeast wind 6 to 13 mph becoming south after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Showers

  • Sunday

    Sunday: Showers, mainly before 2pm. High near 54. Northwest wind 11 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F

    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38. West wind 3 to 7 mph.

    Low: 38 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 49. Northwest wind 8 to 11 mph, with gusts as high as 22 mph.

    High: 49 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 77. Southeast wind 6 to 11 mph, with gusts as high as 23 mph.
Tonight
Showers. Low around 46. Southeast wind 6 to 13 mph becoming south after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Showers, mainly before 2pm. High near 54. Northwest wind 11 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Partly cloudy, with a low around 38. West wind 3 to 7 mph.
Monday
Mostly sunny, with a high near 49. Northwest wind 8 to 11 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 57.
Tuesday Night
Partly cloudy, with a low around 44.
Wednesday
Partly sunny, with a high near 68.
Wednesday Night
Mostly clear, with a low around 44.
Thursday
Sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Duncannon PA
 40.4°N 77.02°W (Elev. 413 ft)
Last Update:
8:06 am EDT Apr 18, 2026
Forecast Valid:
8am EDT Apr 18, 2026-6pm EDT Apr 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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