National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Snow Freezing Fog

23°F

-5°C

Humidity 85%
Wind Speed W 16 G 28 mph
Barometer 29.89 in (1014.6 mb)
Dewpoint 19°F (-7°C)
Visibility 0.25 mi
Wind Chill10°F (-12°C)
Last update 19 Jan 11:53 am EST
Extended Forecast for

Castle Shannon PA

Cold Weather Advisory January 19, 09:00pm until January 20, 12:00pm
Click here for hazard details and duration
Cold Weather Advisory

  • M.L.King Day

    M.L.King Day: A chance of snow showers before 2pm, then a chance of flurries between 2pm and 3pm. Mostly cloudy, with a high near 25. Breezy, with a west wind 21 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 40%. Total daytime snow accumulation of less than a half inch possible.

    High: 25 °F

    Chance Snow
    Showers and
    Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 6. Wind chill values as low as -12. West wind 13 to 18 mph, with gusts as high as 30 mph.

    Low: 6 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 18. Wind chill values as low as -12. West wind 11 to 15 mph, with gusts as high as 25 mph.

    High: 18 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 10. South wind around 7 mph.

    Low: 10 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of snow after 1pm, mixing with rain after 4pm. Mostly cloudy, with a high near 38. Southwest wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A chance of rain and snow before 10pm, then a chance of rain between 10pm and 1am, then a chance of snow after 1am. Mostly cloudy, with a low around 29. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 29 °F

    Chance
    Rain/Snow

  • Thursday

    Thursday: A chance of snow before 1pm. Partly sunny, with a high near 34. Chance of precipitation is 30%.

    High: 34 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 26.

    High: 26 °F

    Mostly Cloudy

Detailed Forecast

M.L.King Day
A chance of snow showers before 2pm, then a chance of flurries between 2pm and 3pm. Mostly cloudy, with a high near 25. Breezy, with a west wind 21 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 40%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Partly cloudy, with a low around 6. Wind chill values as low as -12. West wind 13 to 18 mph, with gusts as high as 30 mph.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 18. Wind chill values as low as -12. West wind 11 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 10. South wind around 7 mph.
Wednesday
A chance of snow after 1pm, mixing with rain after 4pm. Mostly cloudy, with a high near 38. Southwest wind 9 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Wednesday Night
A chance of rain and snow before 10pm, then a chance of rain between 10pm and 1am, then a chance of snow after 1am. Mostly cloudy, with a low around 29. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A chance of snow before 1pm. Partly sunny, with a high near 34. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 14.
Friday
Mostly cloudy, with a high near 26.
Friday Night
Mostly cloudy, with a low around 3.
Saturday
Partly sunny and cold, with a high near 13.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 4. Chance of precipitation is 30%.
Sunday
A chance of snow. Partly sunny, with a high near 19. Chance of precipitation is 40%.
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:
11:54 am EST Jan 19, 2026
Forecast Valid:
12pm EST Jan 19, 2026-6pm EST Jan 25, 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