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.

Overcast

50°F

10°C

Humidity 80%
Wind Speed W 15 G 31 mph
Barometer 29.62 in (1003.8 mb)
Dewpoint 44°F (7°C)
Visibility 8.00 mi
Wind Chill45°F (7°C)
Last update 6 Jan 10:53 pm EST
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: A slight chance of rain. Mostly cloudy, with a low around 39. West wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: A slight chance of rain before 10am. Mostly cloudy, with a high near 45. West wind 8 to 10 mph. Chance of precipitation is 20%.

    High: 45 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 34. West wind around 5 mph becoming south after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 53. South wind around 6 mph.

    High: 53 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 45. Southeast wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 45 °F

    Slight Chance
    Rain then
    Rain Likely

  • Friday

    Friday: Rain. High near 60. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Rain

  • Friday Night

    Friday Night: Rain, mainly after 1am. Low around 48. Chance of precipitation is 80%.

    Low: 48 °F

    Chance Rain
    then Rain

  • Saturday

    Saturday: Rain. High near 59. Chance of precipitation is 80%.

    High: 59 °F

    Rain

  • Saturday Night

    Saturday Night: A chance of rain. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Tonight
A slight chance of rain. Mostly cloudy, with a low around 39. West wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Wednesday
A slight chance of rain before 10am. Mostly cloudy, with a high near 45. West wind 8 to 10 mph. Chance of precipitation is 20%.
Wednesday Night
Mostly cloudy, with a low around 34. West wind around 5 mph becoming south after midnight.
Thursday
Partly sunny, with a high near 53. South wind around 6 mph.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 45. Southeast wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain. High near 60. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Rain, mainly after 1am. Low around 48. Chance of precipitation is 80%.
Saturday
Rain. High near 59. Chance of precipitation is 80%.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Sunday
A chance of snow. Mostly cloudy, with a high near 39. Breezy. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 38.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 42.
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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:
11:03 pm EST Jan 6, 2026
Forecast Valid:
11pm EST Jan 6, 2026-6pm EST Jan 13, 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