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

23°F

-5°C

Humidity 65%
Wind Speed N 3 mph
Barometer 30.39 in (1031.1 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Last update 24 Mar 5:53 am EDT
Extended Forecast for

Castle Shannon PA

  • Today

    Today: Sunny, with a high near 49. Light and variable wind.

    High: 49 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 60. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 60 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 49. South wind 6 to 8 mph.

    Low: 49 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of rain, mainly after 2pm. Mostly cloudy, with a high near 69. Southwest wind 10 to 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: 69 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain and thunderstorms before 8pm, then rain and possibly a thunderstorm between 8pm and 2am, then rain after 2am. Low around 42. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 42 °F

    Rain

  • Friday

    Friday: A chance of rain before 2pm. Mostly cloudy, with a high near 48. Chance of precipitation is 30%.

    High: 48 °F

    Chance Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 49. Light and variable wind.
Tonight
Mostly cloudy, with a low around 34. Calm wind.
Wednesday
Mostly cloudy, with a high near 60. Light and variable wind becoming south 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 49. South wind 6 to 8 mph.
Thursday
A chance of rain, mainly after 2pm. Mostly cloudy, with a high near 69. Southwest wind 10 to 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.
Thursday Night
A chance of rain and thunderstorms before 8pm, then rain and possibly a thunderstorm between 8pm and 2am, then rain after 2am. Low around 42. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Friday
A chance of rain before 2pm. Mostly cloudy, with a high near 48. Chance of precipitation is 30%.
Friday Night
Mostly clear, with a low around 25.
Saturday
Sunny, with a high near 46.
Saturday Night
Mostly clear, with a low around 28.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.35°N 80.03°W (Elev. 1198 ft)
Last Update:
5:36 am EDT Mar 24, 2026
Forecast Valid:
6am EDT Mar 24, 2026-6pm EDT Mar 30, 2026
 
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