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

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Partly Cloudy

71°F

22°C

Humidity 47%
Wind Speed W 8 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 20 Jun 11:53 am EDT
Extended Forecast for

Grindstone PA

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny, with a high near 76. West wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 10pm. Mostly clear, with a low around 55. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 55 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 79. Calm wind becoming west 5 to 7 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm, mainly after 2am. Low around 61. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Mostly Cloudy
    then Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 77. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 77 °F

    Showers

  • Monday Night

    Monday Night: A chance of showers before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 57 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny, with a high near 76. West wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 10pm. Mostly clear, with a low around 55. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 79. Calm wind becoming west 5 to 7 mph in the morning.
Sunday Night
Showers and possibly a thunderstorm, mainly after 2am. Low around 61. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. High near 77. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Monday Night
A chance of showers before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 58. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grindstone PA
 40.03°N 79.87°W (Elev. 1037 ft)
Last Update:
12:06 pm EDT Jun 20, 2026
Forecast Valid:
12pm EDT Jun 20, 2026-6pm EDT Jun 26, 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