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.

Fair

78°F

26°C

Humidity 67%
Wind Speed SW 7 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 6:53 pm EDT
Extended Forecast for

Castle Shannon PA

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 7pm and 8pm. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 63. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 80. Calm wind becoming north around 6 mph in the afternoon.

    High: 80 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 59. North wind 3 to 6 mph.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 81. Calm wind.

    High: 81 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 87.

    High: 87 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 7pm and 8pm. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 63. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Friday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 80. Calm wind becoming north around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 59. North wind 3 to 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 81. Calm wind.
Saturday Night
Mostly clear, with a low around 63. Calm wind.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 68.
Monday
Partly sunny, with a high near 87.
Monday Night
Mostly cloudy, with a low around 71.
Tuesday
Partly sunny, with a high near 88.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.35°N 80.03°W (Elev. 1198 ft)
Last Update:
6:52 pm EDT Aug 27, 2026
Forecast Valid:
6pm EDT Aug 27, 2026-6pm EDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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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