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.

Mostly Cloudy

48°F

9°C

Humidity 68%
Wind Speed Vrbl 3 mph
Barometer 29.98 in (1015.8 mb)
Dewpoint 38°F (3°C)
Visibility 7.00 mi
Last update 21 Mar 11:53 am EDT
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 62. Calm wind.

    High: 62 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 50. South wind 3 to 8 mph.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Scattered showers and thunderstorms after 2pm. Partly sunny, with a high near 77. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms. Low around 38. Northwest wind 11 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Showers

  • Monday

    Monday: Showers likely before 8am. Partly sunny, with a high near 47. Northwest wind around 14 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Showers
    Likely then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 62. Calm wind.
Tonight
Partly cloudy, with a low around 50. South wind 3 to 8 mph.
Sunday
Scattered showers and thunderstorms after 2pm. Partly sunny, with a high near 77. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and thunderstorms. Low around 38. Northwest wind 11 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Showers likely before 8am. Partly sunny, with a high near 47. Northwest wind around 14 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Partly cloudy, with a low around 27.
Tuesday
Mostly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Partly sunny, with a high near 56.
Wednesday Night
Mostly cloudy, with a low around 40.
Thursday
A chance of rain. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Friday
A chance of rain. Partly sunny, with a high near 50. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
7:16 am EDT Mar 21, 2026
Forecast Valid:
12pm EDT Mar 21, 2026-6pm EDT Mar 27, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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