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

45°F

7°C

Humidity 58%
Wind Speed W 15 G 26 mph
Barometer 29.99 in (1016.1 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 5 Apr 2:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 49. West wind 13 to 17 mph, with gusts as high as 28 mph.

    High: 49 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. West wind 9 to 14 mph, with gusts as high as 24 mph.

    Low: 35 °F

    Mostly Cloudy

  • Monday

    Monday: A chance of showers after 3pm. Areas of frost before 7am. Otherwise, partly sunny, with a high near 52. West wind 9 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Areas Frost
    then Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32. Northwest wind around 11 mph, with gusts as high as 22 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 43. Northwest wind 11 to 14 mph.

    High: 43 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 49. West wind 13 to 17 mph, with gusts as high as 28 mph.
Tonight
Mostly cloudy, with a low around 35. West wind 9 to 14 mph, with gusts as high as 24 mph.
Monday
A chance of showers after 3pm. Areas of frost before 7am. Otherwise, partly sunny, with a high near 52. West wind 9 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Partly cloudy, with a low around 32. Northwest wind around 11 mph, with gusts as high as 22 mph.
Tuesday
Mostly sunny, with a high near 43. Northwest wind 11 to 14 mph.
Tuesday Night
Mostly clear, with a low around 26.
Wednesday
Sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Mostly sunny, with a high near 74.
Friday Night
Mostly cloudy, with a low around 52.
Saturday
Partly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
2:21 pm EDT Apr 5, 2026
Forecast Valid:
2pm EDT Apr 5, 2026-6pm EDT Apr 11, 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