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

67°F

19°C

Humidity 30%
Wind Speed SW 12 mph
Barometer 30.03 in (1017.8 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 21 Apr 4:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Showers likely, mainly between 2am and 5am. Mostly cloudy, with a low around 55. Southwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 55 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers before 2pm, then a chance of showers after 4pm. Partly sunny, with a high near 72. Southwest wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 72 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers, mainly before 7pm. Partly cloudy, with a low around 50. Northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 50 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 76. Calm wind becoming west around 5 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55. West wind around 5 mph becoming light and variable in the evening.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

    Low: 58 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Chance of precipitation is 40%.

    Low: 49 °F

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Showers likely, mainly between 2am and 5am. Mostly cloudy, with a low around 55. Southwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A chance of showers before 2pm, then a chance of showers after 4pm. Partly sunny, with a high near 72. Southwest wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A chance of showers, mainly before 7pm. Partly cloudy, with a low around 50. Northwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 76. Calm wind becoming west around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 55. West wind around 5 mph becoming light and variable in the evening.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Saturday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Chance of precipitation is 40%.
Sunday
Partly sunny, with a high near 66.
Sunday Night
Partly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 72.
Monday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 50%.
Tuesday
Showers likely. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
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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 21, 2026
Forecast Valid:
5pm EDT Apr 21, 2026-6pm EDT Apr 28, 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