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.

Fair

17°F

-8°C

Humidity 47%
Wind Speed E 9 mph
Barometer 30.21 in (1025.5 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill6°F (-14°C)
Last update 8 Dec 10:53 pm EST
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Partly cloudy, with a low around 15. East wind around 5 mph becoming south after midnight.

    Low: 15 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 36. South wind 6 to 15 mph, with gusts as high as 25 mph.

    High: 36 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Rain likely after 1am, mixing with snow after 4am. Mostly cloudy, with a low around 32. Southwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 32 °F

    Mostly Cloudy
    then
    Rain/Snow
    Likely

  • Wednesday

    Wednesday: Rain, possibly mixed with snow before 10am, then rain between 10am and 4pm, then rain, possibly mixed with snow after 4pm. High near 41. Breezy, with a southwest wind 17 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 41 °F

    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain and snow, becoming all snow after 10pm. Low around 26. West wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 26 °F

    Rain/Snow
    then Snow

  • Thursday

    Thursday: A chance of snow. Mostly cloudy, with a high near 30. Chance of precipitation is 40%.

    High: 30 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 21. Chance of precipitation is 50%.

    Low: 21 °F

    Chance Snow

  • Friday

    Friday: Snow likely, mainly after 1pm. Mostly cloudy, with a high near 31. Chance of precipitation is 60%.

    High: 31 °F

    Snow Likely

  • Friday Night

    Friday Night: Snow likely, mainly before 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 70%.

    Low: 18 °F

    Snow Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 15. East wind around 5 mph becoming south after midnight.
Tuesday
Partly sunny, with a high near 36. South wind 6 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Rain likely after 1am, mixing with snow after 4am. Mostly cloudy, with a low around 32. Southwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Wednesday
Rain, possibly mixed with snow before 10am, then rain between 10am and 4pm, then rain, possibly mixed with snow after 4pm. High near 41. Breezy, with a southwest wind 17 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Wednesday Night
Rain and snow, becoming all snow after 10pm. Low around 26. West wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday
A chance of snow. Mostly cloudy, with a high near 30. Chance of precipitation is 40%.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 21. Chance of precipitation is 50%.
Friday
Snow likely, mainly after 1pm. Mostly cloudy, with a high near 31. Chance of precipitation is 60%.
Friday Night
Snow likely, mainly before 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 70%.
Saturday
A chance of snow. Mostly cloudy, with a high near 26. Chance of precipitation is 40%.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 14. Chance of precipitation is 40%.
Sunday
Mostly cloudy, with a high near 23.
Sunday Night
Mostly cloudy, with a low around 13.
Monday
Mostly cloudy, with a high near 30.
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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:
11:04 pm EST Dec 8, 2025
Forecast Valid:
11pm EST Dec 8, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation