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.

Light Rain Fog/Mist

37°F

3°C

Humidity 93%
Wind Speed W 15 G 24 mph
Barometer 29.39 in (996.5 mb)
Dewpoint 35°F (2°C)
Visibility 3.00 mi
Wind Chill28°F (-2°C)
Last update 10 Dec 4:53 pm EST
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: A chance of rain. Cloudy, with a high near 43. Southwest wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 43 °F

    Chance Rain

  • Tonight

    Tonight: Rain and snow showers before 10pm, then a chance of snow showers between 10pm and 2am. Low around 22. West wind 14 to 16 mph becoming northwest in the evening. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Rain/Snow
    then Slight
    Chance Snow
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a high near 28. West wind 14 to 17 mph.

    High: 28 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A slight chance of snow showers after 1am. Mostly cloudy, with a low around 22. West wind 6 to 10 mph. Chance of precipitation is 20%.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow
    Showers

  • Friday

    Friday: A chance of snow. Mostly cloudy, with a high near 31. South wind around 6 mph becoming east in the afternoon. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 31 °F

    Chance Snow

  • Friday Night

    Friday Night: A chance of snow before 1am, then a chance of snow showers after 1am. Mostly cloudy, with a low around 23. Chance of precipitation is 50%.

    Low: 23 °F

    Chance Snow

  • Saturday

    Saturday: A chance of snow showers after 1pm. Cloudy, with a high near 30. Chance of precipitation is 50%.

    High: 30 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Saturday Night

    Saturday Night: Snow showers likely, mainly before 1am. Cloudy, with a low around 13. Chance of precipitation is 70%.

    Low: 13 °F

    Snow Showers
    Likely

  • Sunday

    Sunday: A chance of snow showers. Mostly cloudy, with a high near 20. Chance of precipitation is 30%.

    High: 20 °F

    Chance Snow
    Showers

Detailed Forecast

This Afternoon
A chance of rain. Cloudy, with a high near 43. Southwest wind around 17 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain and snow showers before 10pm, then a chance of snow showers between 10pm and 2am. Low around 22. West wind 14 to 16 mph becoming northwest in the evening. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday
Mostly cloudy, with a high near 28. West wind 14 to 17 mph.
Thursday Night
A slight chance of snow showers after 1am. Mostly cloudy, with a low around 22. West wind 6 to 10 mph. Chance of precipitation is 20%.
Friday
A chance of snow. Mostly cloudy, with a high near 31. South wind around 6 mph becoming east in the afternoon. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday Night
A chance of snow before 1am, then a chance of snow showers after 1am. Mostly cloudy, with a low around 23. Chance of precipitation is 50%.
Saturday
A chance of snow showers after 1pm. Cloudy, with a high near 30. Chance of precipitation is 50%.
Saturday Night
Snow showers likely, mainly before 1am. Cloudy, with a low around 13. Chance of precipitation is 70%.
Sunday
A chance of snow showers. Mostly cloudy, with a high near 20. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 14.
Monday
Partly sunny, with a high near 24.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Partly sunny, with a high near 32.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
A chance of rain. Mostly cloudy, with a high near 40.
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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:
11:10 am EST Dec 10, 2025
Forecast Valid:
5pm EST Dec 10, 2025-6pm EST Dec 17, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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