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.

Overcast

58°F

14°C

Humidity 90%
Wind Speed SW 8 mph
Barometer 30.09 in (1019.2 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 5 Mar 8:53 pm EST
Extended Forecast for

Upper St. Clair PA

  • Tonight

    Tonight: A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and midnight. Mostly cloudy, with a low around 55. Southwest wind 5 to 9 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday

    Friday: A chance of rain, mainly between noon and 2pm. Mostly cloudy, with a high near 70. South wind 5 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 70 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: A slight chance of rain after 1am. Partly cloudy, with a low around 58. South wind 6 to 9 mph. Chance of precipitation is 20%.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 76. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Chance Rain
    then Rain and
    Breezy

  • Saturday Night

    Saturday Night: Rain and possibly a thunderstorm. Low around 48. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Monday Night

    Monday Night: A chance of rain after 1am. Partly cloudy, with a low around 52. Chance of precipitation is 30%.

    Low: 52 °F

    Mostly Clear
    then Chance
    Rain

Detailed Forecast

Tonight
A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and midnight. Mostly cloudy, with a low around 55. Southwest wind 5 to 9 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of rain, mainly between noon and 2pm. Mostly cloudy, with a high near 70. South wind 5 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A slight chance of rain after 1am. Partly cloudy, with a low around 58. South wind 6 to 9 mph. Chance of precipitation is 20%.
Saturday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 76. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Rain and possibly a thunderstorm. Low around 48. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 46.
Monday
Sunny, with a high near 69.
Monday Night
A chance of rain after 1am. Partly cloudy, with a low around 52. Chance of precipitation is 30%.
Tuesday
A chance of rain. Partly sunny, with a high near 72. Chance of precipitation is 40%.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.
Wednesday
Rain likely. Mostly cloudy, with a high near 74. Breezy. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.
Thursday
A chance of rain and snow. Partly sunny, with a high near 49. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Upper St. Clair PA
 40.33°N 80.06°W (Elev. 1099 ft)
Last Update:
1:21 pm EST Mar 5, 2026
Forecast Valid:
9pm EST Mar 5, 2026-6pm EDT Mar 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation