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.

Fog/Mist

62°F

17°C

Humidity 93%
Wind Speed S 3 mph
Barometer 29.98 in (1014.7 mb)
Dewpoint 60°F (16°C)
Visibility 3.00 mi
Last update 26 Jul 6:53 am EDT
Extended Forecast for

Upper St. Clair PA

  • Today

    Today: Increasing clouds, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.

    High: 84 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 65. Northwest wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Scattered showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 86. Calm wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Monday Night

    Monday Night: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 68. Southwest wind 6 to 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 68 °F

    Scattered
    T-storms then
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 81. Southwest wind 10 to 13 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 81 °F

    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Partly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.
Tonight
Partly cloudy, with a low around 65. Northwest wind around 5 mph becoming calm in the evening.
Monday
Scattered showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 86. Calm wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 68. Southwest wind 6 to 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
Showers and possibly a thunderstorm. High near 81. Southwest wind 10 to 13 mph becoming west in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 20%.
Wednesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 62.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 64.
Saturday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Upper St. Clair PA
 40.33°N 80.06°W (Elev. 1099 ft)
Last Update:
5:16 am EDT Jul 26, 2026
Forecast Valid:
7am EDT Jul 26, 2026-6pm EDT Aug 1, 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