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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Harrisburg, Capital City Airport (KCXY)

Lat: 40.22°NLon: 76.86°WElev: 335ft.

Fog/Mist

50°F

10°C

Humidity 96%
Wind Speed Calm
Barometer 29.75 in (1007.4 mb)
Dewpoint 49°F (9°C)
Visibility 4.00 mi
Last update 21 Mar 1:56 am EDT
Extended Forecast for

Duncannon PA

  • Overnight

    Overnight: Patchy dense fog. Otherwise, mostly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Patchy Dense
    Fog

  • Saturday

    Saturday: Patchy fog before 7am. Otherwise, partly sunny, with a high near 58. North wind 3 to 7 mph.

    High: 58 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 45. Calm wind becoming south around 5 mph after midnight.

    Low: 45 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms after 2pm. Partly sunny, with a high near 76. South wind 5 to 9 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of rain and thunderstorms before 8pm, then rain and possibly a thunderstorm between 8pm and 11pm, then rain after 11pm. Low around 42. North wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    Low: 42 °F

    Rain

  • Monday

    Monday: Rain, mainly before 8am. High near 49. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 49 °F

    Rain then
    Slight Chance
    Rain

  • Monday Night

    Monday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, mostly cloudy, with a low around 45. Calm wind.
Saturday
Patchy fog before 7am. Otherwise, partly sunny, with a high near 58. North wind 3 to 7 mph.
Saturday Night
Mostly cloudy, with a low around 45. Calm wind becoming south around 5 mph after midnight.
Sunday
A chance of rain and thunderstorms after 2pm. Partly sunny, with a high near 76. South wind 5 to 9 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of rain and thunderstorms before 8pm, then rain and possibly a thunderstorm between 8pm and 11pm, then rain after 11pm. Low around 42. North wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Monday
Rain, mainly before 8am. High near 49. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 48.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Partly sunny, with a high near 57.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 39. Chance of precipitation is 50%.
Friday
A chance of showers. Partly sunny, with a high near 52. 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:
2:05 am EDT Mar 21, 2026
Forecast Valid:
2am EDT Mar 21, 2026-6pm EDT Mar 27, 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