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

46°F

8°C

Humidity 30%
Wind Speed W 7 mph
Barometer 30.31 in (1027.9 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 24 Mar 4:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. Light and variable wind.

    Low: 35 °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: A slight chance of rain after 2am. Mostly cloudy, with a low around 51. Southwest wind 7 to 9 mph. Chance of precipitation is 20%.

    Low: 51 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: A chance of rain, mainly after 8am. Mostly cloudy, with a high near 70. 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: 70 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm. Low around 40. Southwest wind around 14 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 40 °F

    Rain

  • Friday

    Friday: A chance of rain before 2pm. Mostly cloudy, with a high near 48. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    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

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 35. Light and variable wind.
Wednesday
Mostly cloudy, with a high near 60. Light and variable wind becoming south 5 to 8 mph in the morning.
Wednesday Night
A slight chance of rain after 2am. Mostly cloudy, with a low around 51. Southwest wind 7 to 9 mph. Chance of precipitation is 20%.
Thursday
A chance of rain, mainly after 8am. Mostly cloudy, with a high near 70. 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
Rain and possibly a thunderstorm. Low around 40. Southwest wind around 14 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%. 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%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Mostly clear, with a low around 25.
Saturday
Sunny, with a high near 46.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Sunny, with a high near 55.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
A chance of rain. Partly sunny, with a high near 62. Chance of precipitation is 30%.
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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:
2:21 pm EDT Mar 24, 2026
Forecast Valid:
5pm EDT Mar 24, 2026-6pm EDT Mar 31, 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