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Hazardous Weather Conditions

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Overcast

77°F

25°C

Humidity 82%
Wind Speed SW 12 mph
Barometer 30.02 in (1015.8 mb)
Dewpoint 71°F (22°C)
Visibility 9.00 mi
Heat Index79°F (26°C)
Last update 16 Aug 11:53 am EDT
Extended Forecast for

Upper St. Clair PA

Flood Watch August 16, 12:24pm until August 17, 08:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch August 16, 12:24pm until August 17, 08:00am

    NOW until 8:00am Mon

    Flood Watch

  • This Afternoon

    High: 82 °F

    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 2am. Low around 70. Southwest wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    T-storms then
    Chance
    Showers

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 80. West wind 8 to 11 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 60. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 60%.

    High: 80 °F

    Mostly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.

    Low: 62 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Showers and thunderstorms before 4pm, then showers and possibly a thunderstorm, mainly after 4pm. High near 82. West wind around 11 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms, mainly before 2am. Low around 70. Southwest wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 80. West wind 8 to 11 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Mostly clear, with a low around 60. Northwest wind 5 to 8 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 80. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 60.
Saturday
Partly sunny, with a high near 79.
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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:
11:51 am EDT Aug 16, 2026
Forecast Valid:
12pm EDT Aug 16, 2026-6pm EDT Aug 22, 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