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.

Fog/Mist

28°F

-2°C

Humidity 92%
Wind Speed S 5 mph
Barometer 29.92 in (1015.5 mb)
Dewpoint 26°F (-3°C)
Visibility 6.00 mi
Wind Chill22°F (-6°C)
Last update 5 Dec 7:53 pm EST
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. Calm wind becoming southwest around 6 mph after midnight.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 36. Southwest wind 8 to 11 mph.

    High: 36 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Cloudy, with a low around 27. Southwest wind around 6 mph becoming calm in the evening.

    Low: 27 °F

    Cloudy

  • Sunday

    Sunday: A slight chance of rain and snow before 1pm, then a chance of rain between 1pm and 4pm, then a chance of rain and snow after 4pm. Cloudy, with a high near 37. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 40%. Little or no snow accumulation expected.

    High: 37 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of rain and snow before 10pm, then a chance of snow. Mostly cloudy, with a low around 20. North wind 6 to 8 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 20 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Monday

    Monday: Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of snow. Partly sunny, with a high near 35. Chance of precipitation is 30%.

    High: 35 °F

    Chance Snow

  • Tuesday Night

    Tuesday Night: A chance of rain and snow after 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 40%.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

Detailed Forecast

Tonight
Mostly cloudy, with a low around 23. Calm wind becoming southwest around 6 mph after midnight.
Saturday
Mostly cloudy, with a high near 36. Southwest wind 8 to 11 mph.
Saturday Night
Cloudy, with a low around 27. Southwest wind around 6 mph becoming calm in the evening.
Sunday
A slight chance of rain and snow before 1pm, then a chance of rain between 1pm and 4pm, then a chance of rain and snow after 4pm. Cloudy, with a high near 37. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 40%. Little or no snow accumulation expected.
Sunday Night
A chance of rain and snow before 10pm, then a chance of snow. Mostly cloudy, with a low around 20. North wind 6 to 8 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Monday
Mostly sunny, with a high near 27.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
A chance of snow. Partly sunny, with a high near 35. Chance of precipitation is 30%.
Tuesday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 40%.
Wednesday
Rain, mainly after 1pm. High near 41. Chance of precipitation is 80%.
Wednesday Night
Rain and snow. Low around 28. Chance of precipitation is 90%.
Thursday
A chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 50%.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Friday
A chance of snow. Mostly cloudy, with a high near 30. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
5:18 pm EST Dec 5, 2025
Forecast Valid:
8pm EST Dec 5, 2025-6pm EST Dec 12, 2025
 
Forecast Discussion
 
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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