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

31°F

-1°C

Humidity 54%
Wind Speed W 18 G 29 mph
Barometer 30.16 in (1023.1 mb)
Dewpoint 16°F (-9°C)
Visibility 9.00 mi
Wind Chill19°F (-7°C)
Last update 28 Nov 1:53 pm EST
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: A chance of flurries. Mostly cloudy, with a high near 34. Breezy, with a west wind 16 to 20 mph, with gusts as high as 30 mph.

    High: 34 °F

    Chance
    Flurries and
    Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 22. West wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 22 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 36. Southwest wind around 6 mph becoming calm.

    High: 36 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Snow likely before 4am, then snow likely, possibly mixed with rain. Cloudy, with a low around 30. East wind 6 to 11 mph becoming south after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 30 °F

    Chance Snow
    then
    Rain/Snow
    Likely

  • Sunday

    Sunday: Rain and snow, becoming all rain after 10am. High near 42. Breezy, with a south wind 14 to 20 mph becoming west in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 42 °F

    Rain/Snow
    then Rain and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of snow after 1am. Cloudy, with a low around 26. Chance of precipitation is 50%.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

  • Tuesday

    Tuesday: Snow likely, mainly before 1pm. Mostly cloudy, with a high near 35. Chance of precipitation is 60%.

    High: 35 °F

    Snow Likely

Detailed Forecast

This Afternoon
A chance of flurries. Mostly cloudy, with a high near 34. Breezy, with a west wind 16 to 20 mph, with gusts as high as 30 mph.
Tonight
Partly cloudy, with a low around 22. West wind 7 to 11 mph, with gusts as high as 21 mph.
Saturday
Increasing clouds, with a high near 36. Southwest wind around 6 mph becoming calm.
Saturday Night
Snow likely before 4am, then snow likely, possibly mixed with rain. Cloudy, with a low around 30. East wind 6 to 11 mph becoming south after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Sunday
Rain and snow, becoming all rain after 10am. High near 42. Breezy, with a south wind 14 to 20 mph becoming west in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly cloudy, with a low around 27.
Monday
Mostly cloudy, with a high near 34.
Monday Night
A chance of snow after 1am. Cloudy, with a low around 26. Chance of precipitation is 50%.
Tuesday
Snow likely, mainly before 1pm. Mostly cloudy, with a high near 35. Chance of precipitation is 60%.
Tuesday Night
Mostly cloudy, with a low around 22.
Wednesday
Partly sunny, with a high near 33.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
Mostly cloudy, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
12:25 pm EST Nov 28, 2025
Forecast Valid:
2pm EST Nov 28, 2025-6pm EST Dec 4, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation