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.

Overcast

44°F

7°C

Humidity 83%
Wind Speed NW 8 mph
Barometer 29.86 in (1011.8 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 14 May 5:53 am EDT
Extended Forecast for

Grindstone PA

  • Today

    Today: A chance of sprinkles with a slight chance of showers before 10am, then a chance of showers, mainly between 10am and 5pm. Mostly cloudy, with a high near 56. West wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 56 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers before 9pm, then a chance of sprinkles between 9pm and 10pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind 3 to 7 mph. Chance of precipitation is 20%.

    Low: 40 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 69. Calm wind becoming west around 6 mph in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 90.

    High: 90 °F

    Hot

Detailed Forecast

Today
A chance of sprinkles with a slight chance of showers before 10am, then a chance of showers, mainly between 10am and 5pm. Mostly cloudy, with a high near 56. West wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A slight chance of showers before 9pm, then a chance of sprinkles between 9pm and 10pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 40. Northwest wind 3 to 7 mph. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 69. Calm wind becoming west around 6 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 49. Calm wind.
Saturday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Southwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Sunday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
Monday
Sunny and hot, with a high near 90.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Mostly sunny and hot, with a high near 91.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 84. Chance of precipitation is 70%.
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ABOUT THIS FORECAST

 
Point Forecast:
Grindstone PA
 40.02°N 79.84°W (Elev. 879 ft)
Last Update:
5:46 am EDT May 14, 2026
Forecast Valid:
6am EDT May 14, 2026-6pm EDT May 20, 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