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

Hazardous Weather Conditions

Current conditions at

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Duncannon PA

Heat Advisory until July 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 17, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Today

    High: 92 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 68. West wind 3 to 7 mph.

    Low: 68 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 83. North wind around 6 mph.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 40%.

    High: 85 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Today
A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 92. Heat index values as high as 102. West wind 8 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 68. West wind 3 to 7 mph.
Friday
Mostly sunny, with a high near 83. North wind around 6 mph.
Friday Night
Partly cloudy, with a low around 65. Calm wind.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 65.
Wednesday
A chance of showers. Partly sunny, with a high near 87. Chance of precipitation is 30%.
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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:
4:44 am EDT Jul 17, 2025
Forecast Valid:
11am EDT Jul 17, 2025-6pm EDT Jul 23, 2025
 
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