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

48°F

9°C

Humidity 52%
Wind Speed Calm
Barometer 30.14 in (1021.7 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 24 Nov 5:53 pm EST
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. South wind 3 to 6 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain, mainly before 4pm. High near 56. South wind 7 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly after 7pm. Low around 51. South wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain, mainly before 1pm. High near 58. Breezy, with a southwest wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 58 °F

    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29. West wind around 18 mph, with gusts as high as 30 mph.

    Low: 29 °F

    Mostly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Mostly cloudy, with a high near 34. Breezy.

    High: 34 °F

    Mostly Cloudy
    and Breezy

  • Thursday Night

    Thursday Night: A chance of snow showers after 1am. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Friday

    Friday: Mostly cloudy, with a high near 33. Breezy.

    High: 33 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 40. South wind 3 to 6 mph.
Tuesday
Rain, mainly before 4pm. High near 56. South wind 7 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Rain, mainly after 7pm. Low around 51. South wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Rain, mainly before 1pm. High near 58. Breezy, with a southwest wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 29. West wind around 18 mph, with gusts as high as 30 mph.
Thanksgiving Day
Mostly cloudy, with a high near 34. Breezy.
Thursday Night
A chance of snow showers after 1am. Mostly cloudy, with a low around 25. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 33. Breezy.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Mostly cloudy, with a high near 35.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Sunday
A chance of rain. Cloudy, with a high near 44. Chance of precipitation is 40%.
Sunday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Monday
Rain likely. Cloudy, with a high near 48. Chance of precipitation is 60%.
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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:
5:46 pm EST Nov 24, 2025
Forecast Valid:
6pm EST Nov 24, 2025-6pm EST Dec 1, 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