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.

Light Snow

24°F

-4°C

Humidity 75%
Wind Speed NW 8 G 22 mph
Barometer 30.04 in (1019.1 mb)
Dewpoint 17°F (-8°C)
Visibility 9.00 mi
Wind Chill15°F (-9°C)
Last update 18 Jan 3:53 am EST
Extended Forecast for

Castle Shannon PA

  • Overnight

    Overnight: A slight chance of snow. Mostly cloudy, with a low around 18. West wind around 8 mph. Chance of precipitation is 20%.

    Low: 18 °F

    Slight Chance
    Snow

  • Sunday

    Sunday: Partly sunny, with a high near 24. West wind 7 to 10 mph.

    High: 24 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of snow between 2am and 5am. Mostly cloudy, with a low around 16. Southwest wind 6 to 11 mph. Chance of precipitation is 20%.

    Low: 16 °F

    Partly Cloudy
    then Slight
    Chance Snow

  • M.L.King Day

    M.L.King Day: A chance of snow between 7am and 1pm. Mostly cloudy, with a high near 26. Breezy, with a southwest wind 14 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    High: 26 °F

    Chance Snow
    and Breezy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 6. West wind 15 to 18 mph, with gusts as high as 30 mph.

    Low: 6 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 18.

    High: 18 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 10.

    Low: 10 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.

    High: 37 °F

    Chance Snow

  • Wednesday Night

    Wednesday Night: A chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 50%.

    Low: 22 °F

    Chance Snow

Detailed Forecast

Overnight
A slight chance of snow. Mostly cloudy, with a low around 18. West wind around 8 mph. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 24. West wind 7 to 10 mph.
Sunday Night
A slight chance of snow between 2am and 5am. Mostly cloudy, with a low around 16. Southwest wind 6 to 11 mph. Chance of precipitation is 20%.
M.L.King Day
A chance of snow between 7am and 1pm. Mostly cloudy, with a high near 26. Breezy, with a southwest wind 14 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Monday Night
Mostly cloudy, with a low around 6. West wind 15 to 18 mph, with gusts as high as 30 mph.
Tuesday
Mostly sunny, with a high near 18.
Tuesday Night
Partly cloudy, with a low around 10.
Wednesday
A chance of snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 50%.
Thursday
A chance of snow before 1pm. Partly sunny, with a high near 28. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 12.
Friday
Partly sunny, with a high near 33.
Friday Night
A chance of snow. Mostly cloudy, with a low around 23. Chance of precipitation is 40%.
Saturday
A chance of snow. Mostly cloudy, with a high near 31. Chance of precipitation is 50%.
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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:
11:43 pm EST Jan 17, 2026
Forecast Valid:
4am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation