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

49°F

9°C

Humidity 97%
Wind Speed Calm
Barometer 29.78 in (1008.7 mb)
Dewpoint 48°F (9°C)
Visibility 0.25 mi
Last update 21 Mar 4:56 am EDT
Extended Forecast for

Duncannon PA

Dense Fog Advisory until March 21, 08:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until March 21, 08:00am

    NOW until 8:00am Sat

    Dense Fog Advisory

  • Overnight

    Low: 46 °F

    Areas Dense
    Fog

  • Saturday

    Saturday: Areas of dense fog before 8am.  Otherwise, partly sunny, with a high near 58. North wind 3 to 7 mph.

    High: 58 °F

    Areas Dense
    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. Some of the storms could be severe.  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 Severe
    Thunderstorms

  • 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. Some of the storms could be severe.  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

    Severe
    Thunderstorms
    then 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 48.

    High: 48 °F

    Sunny

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 46. North wind around 5 mph.
Saturday
Areas of dense fog before 8am. 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. Some of the storms could be severe. 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. Some of the storms could be severe. 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 48.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Partly sunny, with a high near 54.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
Partly sunny, with a high near 58.
Thursday Night
Rain likely. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
Friday
A chance of rain. 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)
3:36 am EDT Mar 21, 2026
5am EDT Mar 21, 2026-6pm EDT Mar 27, 2026
 
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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