National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Flooding Risks from Tropical Moisture Across the Southeast and Southwest

Tropical moisture from Isaias and Rachel will impact portions of the Southeast and Southwest this weekend. Flash flooding, strong winds and even a threat for severe thunderstorms and tornadoes are possible. Meanwhile, strong winds and dry fuels are raising fire weather concerns across the central Great Basin and western High Plains. Across the northern Rockies, first winter storm of the season. Read More >

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Fair

68°F

20°C

Humidity 45%
Wind Speed SE 9 mph
Barometer 30.33 in (1027.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 10 Oct 12:53 pm EDT
Extended Forecast for

Upper St. Clair PA

  • This Afternoon

    This Afternoon: Cloudy, with a high near 71. Southeast wind 5 to 13 mph.

    High: 71 °F

    Cloudy

  • Tonight

    Tonight: Showers, with thunderstorms also possible after 5am. Low around 57. East wind 11 to 14 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Mostly Cloudy
    then Showers

  • Sunday

    Sunday: Showers and thunderstorms, mainly before 4pm. High near 67. East wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 67 °F

    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 59. Northeast wind 5 to 7 mph becoming northwest after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 59 °F

    Chance
    Showers then
    Mostly Cloudy

  • Columbus Day

    Columbus Day: Mostly cloudy, with a high near 70. Northwest wind around 8 mph.

    High: 70 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Cloudy, with a high near 71. Southeast wind 5 to 13 mph.
Tonight
Showers, with thunderstorms also possible after 5am. Low around 57. East wind 11 to 14 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers and thunderstorms, mainly before 4pm. High near 67. East wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
A chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 59. Northeast wind 5 to 7 mph becoming northwest after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Columbus Day
Mostly cloudy, with a high near 70. Northwest wind around 8 mph.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 68.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
Friday
A chance of showers. Mostly cloudy, with a high near 66. Breezy. Chance of precipitation is 50%.
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 80.09°W (Elev. 1178 ft)
Last Update:
12:46 pm EDT Oct 10, 2026
Forecast Valid:
1pm EDT Oct 10, 2026-6pm EDT Oct 16, 2026
 
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