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.

Overcast

17°F

-8°C

Humidity 68%
Wind Speed SW 3 mph
Barometer 30.11 in (1022.7 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 15 Dec 9:53 pm EST
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 12. Southwest wind around 7 mph.

    Low: 12 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 33. South wind 6 to 10 mph.

    High: 33 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 27. South wind 8 to 14 mph.

    Low: 27 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.

    High: 41 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27. Southwest wind around 6 mph becoming southeast after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of rain after 1pm. Mostly cloudy, with a high near 50. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    High: 50 °F

    Partly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 26. Chance of precipitation is 100%.

    Low: 26 °F

    Rain

  • Friday

    Friday: Mostly cloudy, with a high near 32.

    High: 32 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 12. Southwest wind around 7 mph.
Tuesday
Increasing clouds, with a high near 33. South wind 6 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 27. South wind 8 to 14 mph.
Wednesday
Mostly cloudy, with a high near 41. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
Mostly cloudy, with a low around 27. Southwest wind around 6 mph becoming southeast after midnight.
Thursday
A chance of rain after 1pm. Mostly cloudy, with a high near 50. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Rain. Low around 26. Chance of precipitation is 100%.
Friday
Mostly cloudy, with a high near 32.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Mostly cloudy, with a high near 44.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 33. Chance of precipitation is 30%.
Sunday
A chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 30%.
Sunday Night
A chance of rain or freezing rain. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Monday
A chance of rain. Mostly cloudy, with a high near 42. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.35°N 80.03°W (Elev. 1198 ft)
Last Update:
8:49 pm EST Dec 15, 2025
Forecast Valid:
10pm EST Dec 15, 2025-6pm EST Dec 22, 2025
 
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