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

78°F

26°C

Humidity 52%
Wind Speed NA
Barometer 30.11 in (1019.4 mb)
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Heat Index79°F (26°C)
Last update 19 Sep 11:53 am EDT
Extended Forecast for

Upper St. Clair PA

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. North wind 3 to 6 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Northeast wind around 6 mph.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 85. East wind around 7 mph.

    High: 85 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 63. Southeast wind around 7 mph.

    Low: 63 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 84. South wind 7 to 11 mph.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: A chance of showers before 8am, then a chance of showers after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 85. North wind 3 to 6 mph.
Tonight
Mostly clear, with a low around 59. Northeast wind around 6 mph.
Saturday
Increasing clouds, with a high near 85. East wind around 7 mph.
Saturday Night
Mostly cloudy, with a low around 63. Southeast wind around 7 mph.
Sunday
Mostly sunny, with a high near 84. South wind 7 to 11 mph.
Sunday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Monday
A chance of showers before 8am, then a chance of showers after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.
Tuesday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 75.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Upper St. Clair PA
 40.33°N 80.06°W (Elev. 1099 ft)
Last Update:
10:02 am EDT Sep 19, 2025
Forecast Valid:
12pm EDT Sep 19, 2025-6pm EDT Sep 25, 2025
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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