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.

Fair

58°F

14°C

Humidity 72%
Wind Speed Calm
Barometer 30.10 in (1019.3 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 23 Jul 2:53 am EDT
Extended Forecast for

Castle Shannon PA

  • Overnight

    Overnight: Clear, with a low around 54. Calm wind.

    Low: 54 °F

    Clear

  • Thursday

    Thursday: Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 76. Calm wind becoming northeast around 6 mph in the morning.

    High: 76 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. Northeast wind 3 to 5 mph.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 81. East wind 5 to 7 mph.

    High: 81 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63. Southeast wind around 6 mph.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 54. Calm wind.
Thursday
Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 76. Calm wind becoming northeast around 6 mph in the morning.
Thursday Night
Mostly clear, with a low around 56. Northeast wind 3 to 5 mph.
Friday
Partly sunny, with a high near 81. East wind 5 to 7 mph.
Friday Night
Partly cloudy, with a low around 63. Southeast wind around 6 mph.
Saturday
A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Monday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.35°N 80.03°W (Elev. 1198 ft)
Last Update:
2:36 am EDT Jul 23, 2026
Forecast Valid:
3am EDT Jul 23, 2026-6pm EDT Jul 29, 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