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.

Overcast

53°F

12°C

Humidity 69%
Wind Speed Vrbl 5 mph
Barometer 29.85 in (1011.4 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 6 May 5:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 42. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 42 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Increasing clouds, with a high near 59. Light northwest wind becoming west 6 to 11 mph in the morning.

    High: 59 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 40. Northwest wind 5 to 10 mph becoming southwest after midnight.

    Low: 40 °F

    Increasing
    Clouds

  • Friday

    Friday: A slight chance of showers after 2pm. Partly sunny, with a high near 62. West wind 9 to 15 mph. Chance of precipitation is 20%.

    High: 62 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers, mainly after 8pm. Low around 49. South wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 2pm. High near 68. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers after 2pm. Partly sunny, with a high near 74. Chance of precipitation is 50%.

    High: 74 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 42. Northwest wind 5 to 10 mph becoming light after midnight.
Thursday
Increasing clouds, with a high near 59. Light northwest wind becoming west 6 to 11 mph in the morning.
Thursday Night
Increasing clouds, with a low around 40. Northwest wind 5 to 10 mph becoming southwest after midnight.
Friday
A slight chance of showers after 2pm. Partly sunny, with a high near 62. West wind 9 to 15 mph. Chance of precipitation is 20%.
Friday Night
Showers, mainly after 8pm. Low around 49. South wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Showers, with thunderstorms also possible after 2pm. High near 68. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
A chance of showers after 2pm. Partly sunny, with a high near 74. Chance of precipitation is 50%.
Sunday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Monday
A chance of showers before 8am. Partly sunny, with a high near 60. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Wednesday
Showers likely. Mostly cloudy, with a high near 68. 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:
2:21 pm EDT May 6, 2026
Forecast Valid:
6pm EDT May 6, 2026-6pm EDT May 13, 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