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

67°F

19°C

Humidity 39%
Wind Speed NE 5 mph
Barometer 30.22 in (1023.5 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 31 Aug 9:53 pm EDT
Extended Forecast for

Upper St. Clair PA

  • Tonight

    Tonight: Clear, with a low around 51. East wind 3 to 5 mph.

    Low: 51 °F

    Clear

  • Labor Day

    Labor Day: Sunny, with a high near 78. East wind 3 to 7 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. East wind around 6 mph becoming calm in the evening.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 54. Light south wind.

    Low: 54 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of rain before 2pm, then a slight chance of showers between 2pm and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 77. Chance of precipitation is 20%.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers after 2am. Partly cloudy, with a low around 59. Chance of precipitation is 30%.

    Low: 59 °F

    Partly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 74. Chance of precipitation is 80%.

    High: 74 °F

    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 51. East wind 3 to 5 mph.
Labor Day
Sunny, with a high near 78. East wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 54. East wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 79. Calm wind becoming southeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 54. Light south wind.
Wednesday
A chance of rain before 2pm, then a slight chance of showers between 2pm and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 77. Chance of precipitation is 20%.
Wednesday Night
A chance of showers after 2am. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Thursday
A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 74. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers. Low around 53. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Mostly clear, with a low around 49.
Sunday
Sunny, with a high near 72.
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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 pm EDT Aug 31, 2025
Forecast Valid:
10pm EDT Aug 31, 2025-6pm EDT Sep 7, 2025
 
Forecast Discussion
 
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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