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.

Fair

80°F

27°C

Humidity 49%
Wind Speed Calm
Barometer 30.19 in (1021.8 mb)
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Heat Index81°F (27°C)
Last update 15 Aug 10:53 am EDT
Extended Forecast for

Grindstone PA

  • Today

    Today: Sunny and hot, with a high near 90. Calm wind.

    High: 90 °F

    Hot

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, sunny and hot, with a high near 91. Calm wind.

    High: 91 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Slight Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 66. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Chance
    T-storms then
    Slight Chance
    Showers and
    Patchy Fog

  • Monday

    Monday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 88.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
Sunny and hot, with a high near 90. Calm wind.
Tonight
Patchy fog after 4am. Otherwise, mostly clear, with a low around 63. Calm wind.
Saturday
Patchy fog before 9am. Otherwise, sunny and hot, with a high near 91. Calm wind.
Saturday Night
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 67. Calm wind.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 66. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 66.
Tuesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 81. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Thursday
Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
Grindstone PA
 40.03°N 79.87°W (Elev. 1037 ft)
Last Update:
11:02 am EDT Aug 15, 2025
Forecast Valid:
11am EDT Aug 15, 2025-6pm EDT Aug 21, 2025
 
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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