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.

Fog/Mist

40°F

4°C

Humidity 97%
Wind Speed S 9 mph
Barometer 29.63 in (1004.8 mb)
Dewpoint 39°F (4°C)
Visibility 0.75 mi
Wind Chill34°F (1°C)
Last update 26 Dec 2:53 pm EST
Extended Forecast for

Castle Shannon PA

  • This Afternoon

    This Afternoon: Rain, with thunderstorms also possible after 4pm. High near 48. South wind around 13 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 48 °F

    Rain

  • Tonight

    Tonight: Rain likely and possibly a thunderstorm before 8pm, then a slight chance of rain between 8pm and 9pm. Cloudy, with a low around 35. Northwest wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 35 °F

    Rain Likely
    then Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 40. Northwest wind around 6 mph becoming calm in the morning.

    High: 40 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32. Calm wind becoming east around 5 mph after midnight.

    Low: 32 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain. High near 60. South wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Rain

  • Sunday Night

    Sunday Night: Rain. Low around 51. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 51 °F

    Rain

  • Monday

    Monday: Rain before 1pm, then a chance of snow. High near 54. Breezy. Chance of precipitation is 80%.

    High: 54 °F

    Breezy. Rain
    then
    Rain/Snow

  • Monday Night

    Monday Night: Snow showers likely, mainly before 1am. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 70%.

    Low: 22 °F

    Snow Showers
    Likely and
    Breezy

  • Tuesday

    Tuesday: A chance of snow showers before 1pm. Mostly cloudy, with a high near 28. Breezy. Chance of precipitation is 30%.

    High: 28 °F

    Chance Snow
    Showers and
    Breezy

Detailed Forecast

This Afternoon
Rain, with thunderstorms also possible after 4pm. High near 48. South wind around 13 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain likely and possibly a thunderstorm before 8pm, then a slight chance of rain between 8pm and 9pm. Cloudy, with a low around 35. Northwest wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly cloudy, with a high near 40. Northwest wind around 6 mph becoming calm in the morning.
Saturday Night
Mostly cloudy, with a low around 32. Calm wind becoming east around 5 mph after midnight.
Sunday
Rain. High near 60. South wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain. Low around 51. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain before 1pm, then a chance of snow. High near 54. Breezy. Chance of precipitation is 80%.
Monday Night
Snow showers likely, mainly before 1am. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 70%.
Tuesday
A chance of snow showers before 1pm. Mostly cloudy, with a high near 28. Breezy. Chance of precipitation is 30%.
Tuesday Night
A chance of snow showers after 1am. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Wednesday
A chance of snow showers. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.
Wednesday Night
A chance of snow showers. Mostly cloudy, with a low around 18. Chance of precipitation is 40%.
New Year's Day
Mostly cloudy, with a high near 24.
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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:
1:53 pm EST Dec 26, 2025
Forecast Valid:
3pm EST Dec 26, 2025-6pm EST Jan 1, 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