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

59°F

15°C

Humidity 16%
Wind Speed S 10 G 18 mph
Barometer 30.35 in (1029.1 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Last update 8 Apr 4:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly clear, with a low around 37. South wind around 9 mph.

    Low: 37 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 72. Southwest wind 8 to 11 mph.

    High: 72 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 51. South wind around 7 mph.

    Low: 51 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers after 2pm. Mostly sunny, with a high near 74. Southwest wind 8 to 15 mph. Chance of precipitation is 20%.

    High: 74 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 44. West wind 8 to 10 mph becoming northwest after midnight. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 37. South wind around 9 mph.
Thursday
Sunny, with a high near 72. Southwest wind 8 to 11 mph.
Thursday Night
Mostly clear, with a low around 51. South wind around 7 mph.
Friday
A slight chance of showers after 2pm. Mostly sunny, with a high near 74. Southwest wind 8 to 15 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 44. West wind 8 to 10 mph becoming northwest after midnight. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Sunny, with a high near 63.
Saturday Night
Partly cloudy, with a low around 44.
Sunday
Mostly sunny, with a high near 78.
Sunday Night
Mostly cloudy, with a low around 63.
Monday
A chance of showers after 2pm. Mostly cloudy, with a high near 77. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Tuesday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 40%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
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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:
2:21 pm EDT Apr 8, 2026
Forecast Valid:
5pm EDT Apr 8, 2026-6pm EDT Apr 15, 2026
 
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