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.

Light Rain Fog/Mist

45°F

7°C

Humidity 97%
Wind Speed Calm
Barometer 29.50 in (999.5 mb)
Dewpoint 44°F (7°C)
Visibility 1.00 mi
Last update 12 Nov 9:53 am EST
Extended Forecast for

Castle Shannon PA

  • Today

    Today: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 50. Northwest wind 6 to 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 50 °F

    Showers
    Likely

  • Tonight

    Tonight: A chance of rain showers before 4am, then a slight chance of snow showers after 5am. Mostly cloudy, with a low around 37. North wind around 11 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 37 °F

    Chance
    Showers then
    Slight Chance
    Rain/Snow

  • Friday

    Friday: A slight chance of rain and snow showers before 9am, then a chance of rain showers. Mostly cloudy, with a high near 44. Northwest wind 9 to 11 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 44 °F

    Slight Chance
    Rain/Snow
    then Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 32. Northwest wind 5 to 8 mph.

    Low: 32 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, mainly after 1pm. Mostly cloudy, with a high near 43. West wind 8 to 15 mph. Chance of precipitation is 30%.

    High: 43 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly cloudy, with a low around 34. Chance of precipitation is 20%.

    Low: 34 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 48.

    High: 48 °F

    Mostly Cloudy

Detailed Forecast

Today
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 50. Northwest wind 6 to 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A chance of rain showers before 4am, then a slight chance of snow showers after 5am. Mostly cloudy, with a low around 37. North wind around 11 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday
A slight chance of rain and snow showers before 9am, then a chance of rain showers. Mostly cloudy, with a high near 44. Northwest wind 9 to 11 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Friday Night
Mostly cloudy, with a low around 32. Northwest wind 5 to 8 mph.
Saturday
A chance of showers, mainly after 1pm. Mostly cloudy, with a high near 43. West wind 8 to 15 mph. Chance of precipitation is 30%.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 34. Chance of precipitation is 20%.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
Mostly cloudy, with a low around 36.
Monday
Mostly cloudy, with a high near 48.
Monday Night
Mostly cloudy, with a low around 32.
Tuesday
Mostly sunny, with a high near 49.
Tuesday Night
Mostly clear, with a low around 29.
Wednesday
Sunny, with a high near 53.
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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:
5:16 am EST Nov 12, 2026
Forecast Valid:
10am EST Nov 12, 2026-6pm EST Nov 18, 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