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

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Mostly Cloudy

56°F

13°C

Humidity 30%
Wind Speed S 9 mph
Barometer 30.17 in (1022.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 29 Mar 11:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Overnight

    Overnight: Mostly cloudy, with a low around 49. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 49 °F

    Mostly Cloudy

  • Monday

    Monday: Scattered showers before 11am, then isolated showers after 5pm. Mostly cloudy, with a high near 65. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 65 °F

    Scattered
    Showers then
    Mostly Cloudy

  • Monday Night

    Monday Night: Scattered showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 2am, then rain likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 58. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 58 °F

    Scattered
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Rain likely, mainly before 8am. Mostly cloudy, with a high near 76. Southwest wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 76 °F

    Rain Likely
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: A slight chance of thunderstorms, then a chance of rain and thunderstorms after 8pm. Mostly cloudy, with a low around 59. Southwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 59 °F

    Slight Chance
    T-storms then
    Chance Rain

  • Wednesday

    Wednesday: Rain, with thunderstorms also possible after 2pm. High near 72. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.

    Low: 53 °F

    Rain Likely

  • Thursday

    Thursday: Rain likely, mainly after 8am. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.

    High: 75 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly before 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

    Low: 58 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 49. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Monday
Scattered showers before 11am, then isolated showers after 5pm. Mostly cloudy, with a high near 65. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday Night
Scattered showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 2am, then rain likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 58. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Rain likely, mainly before 8am. Mostly cloudy, with a high near 76. Southwest wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A slight chance of thunderstorms, then a chance of rain and thunderstorms after 8pm. Mostly cloudy, with a low around 59. Southwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Rain, with thunderstorms also possible after 2pm. High near 72. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Thursday
Rain likely, mainly after 8am. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
Thursday Night
Rain likely, mainly before 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Friday
Rain likely, mainly after 8am. Mostly cloudy, with a high near 73. Chance of precipitation is 60%.
Friday Night
A chance of rain. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.
Saturday
Rain likely. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
Saturday Night
Rain likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Sunday
Rain likely. Mostly cloudy, with a high near 74. Chance of precipitation is 60%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
7:06 pm EDT Mar 29, 2026
Forecast Valid:
12am EDT Mar 30, 2026-6pm EDT Apr 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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