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

33°F

1°C

Humidity 40%
Wind Speed S 13 mph
Barometer 30.19 in (1024.6 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 18 Mar 3:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 38. South wind around 8 mph.

    High: 38 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 32. South wind 5 to 7 mph.

    Low: 32 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of rain after 2pm. Mostly cloudy, with a high near 50. South wind around 7 mph. Chance of precipitation is 20%.

    High: 50 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 37. Light and variable wind.

    Low: 37 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of rain after 2pm. Mostly cloudy, with a high near 60. Southwest wind 6 to 11 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 60 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: Rain and thunderstorms likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Rain Likely

  • Saturday

    Saturday: A chance of rain before 8am. Partly sunny, with a high near 64. Chance of precipitation is 30%.

    High: 64 °F

    Chance Rain
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain after 2pm. Partly sunny, with a high near 69. Chance of precipitation is 30%.

    High: 69 °F

    Mostly Sunny
    then Chance
    Rain

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 38. South wind around 8 mph.
Tonight
Mostly cloudy, with a low around 32. South wind 5 to 7 mph.
Thursday
A slight chance of rain after 2pm. Mostly cloudy, with a high near 50. South wind around 7 mph. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 37. Light and variable wind.
Friday
A chance of rain after 2pm. Mostly cloudy, with a high near 60. Southwest wind 6 to 11 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of rain before 8am. Partly sunny, with a high near 64. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
A chance of rain after 2pm. Partly sunny, with a high near 69. Chance of precipitation is 30%.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 46.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Partly sunny, with a high near 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 Mar 18, 2026
Forecast Valid:
4pm EDT Mar 18, 2026-6pm EDT Mar 24, 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