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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Mostly Cloudy

73°F

23°C

Humidity 74%
Wind Speed Vrbl 3 mph
Barometer 30.16 in (1021.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 18 Sep 4:53 pm EDT
Extended Forecast for

Mc Keesport PA

  • Tonight

    Tonight: Partly cloudy, with a low around 58. Northeast wind 5 to 8 mph.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 80. East wind around 5 mph.

    High: 80 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Showers likely, mainly after 5am. Increasing clouds, with a low around 65. East wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 65 °F

    Partly Cloudy
    then Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 78. Southwest wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North wind 7 to 9 mph. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 70 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 58. Chance of precipitation is 70%.

    Low: 58 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 8am, then showers likely between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Cloudy, with a high near 67. Chance of precipitation is 70%.

    High: 67 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Chance of precipitation is 70%.

    Low: 55 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. Northeast wind 5 to 8 mph.
Saturday
Partly sunny, with a high near 80. East wind around 5 mph.
Saturday Night
Showers likely, mainly after 5am. Increasing clouds, with a low around 65. East wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers and possibly a thunderstorm. High near 78. Southwest wind around 9 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. North wind 7 to 9 mph. Chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A chance of showers, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 58. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm before 8am, then showers likely between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Cloudy, with a high near 67. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Chance of precipitation is 70%.
Wednesday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 66. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
Mc Keesport PA
 40.33°N 79.83°W (Elev. 942 ft)
Last Update:
2:22 pm EDT Sep 18, 2026
Forecast Valid:
5pm EDT Sep 18, 2026-6pm EDT Sep 25, 2026
 
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