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

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

A Few Clouds

84°F

29°C

Humidity 43%
Wind Speed Vrbl 3 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 15 Aug 2:56 pm EDT
Extended Forecast for

Duncannon PA

  • Tonight

    Tonight: Increasing clouds, with a low around 69. Calm wind.

    Low: 69 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 78. South wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 78 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 2am, then a chance of showers. Low around 68. Southeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 68 °F

    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Northwest wind 3 to 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 69. Calm wind.
Sunday
Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 78. South wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and thunderstorms before 2am, then a chance of showers. Low around 68. Southeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Monday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Northwest wind 3 to 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny, with a high near 85.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
Thursday
A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Partly sunny, with a high near 79.
Friday Night
Mostly cloudy, with a low around 60.
Saturday
A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Duncannon PA
 40.4°N 77.02°W (Elev. 413 ft)
Last Update:
3:16 pm EDT Aug 15, 2026
Forecast Valid:
3pm EDT Aug 15, 2026-6pm EDT Aug 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation