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.

Light Rain

61°F

16°C

Humidity 48%
Wind Speed SW 6 mph
Barometer 29.97 in (1014.7 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 22 Apr 4:53 am EDT
Extended Forecast for

Castle Shannon PA

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Low around 57. West wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms before 4pm, then a slight chance of showers after 5pm. High near 72. Southwest wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Showers then
    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 50. Northwest wind around 6 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 56. South wind 3 to 5 mph.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely, then showers and possibly a thunderstorm after 8am. High near 70. Chance of precipitation is 80%.

    High: 70 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely then
    Chance
    Showers

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 57. West wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers and thunderstorms before 4pm, then a slight chance of showers after 5pm. High near 72. Southwest wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Mostly clear, with a low around 50. Northwest wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 56. South wind 3 to 5 mph.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 40%.
Friday Night
A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Saturday
Showers likely, then showers and possibly a thunderstorm after 8am. High near 70. Chance of precipitation is 80%.
Saturday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 66.
Sunday Night
Partly cloudy, with a low around 47.
Monday
A chance of showers. Mostly sunny, with a high near 72. Chance of precipitation is 30%.
Monday Night
Showers likely. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Tuesday
Showers likely. Mostly cloudy, with a high near 70. Chance of precipitation is 70%.
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Shannon PA
 40.37°N 80.02°W (Elev. 1109 ft)
Last Update:
5:36 am EDT Apr 22, 2026
Forecast Valid:
5am EDT Apr 22, 2026-6pm EDT Apr 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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