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

Hazardous Weather Conditions

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Overcast

70°F

21°C

Humidity 90%
Wind Speed S 3 mph
Barometer 29.98 in (1014.7 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 20 Aug 2:53 am EDT
Extended Forecast for

Grindstone PA

  • Overnight

    Overnight: A chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 11am. High near 75. Light and variable wind. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 75 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: A chance of showers, mainly before 7pm. Patchy dense fog after 9pm. Otherwise, partly cloudy, with a low around 60. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Dense Fog

  • Friday

    Friday: A chance of showers and thunderstorms, mainly after 3pm. Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming east around 5 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Patchy Dense
    Fog then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 8pm, then showers likely between 8pm and 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers after 2pm. Partly sunny, with a high near 75. Chance of precipitation is 30%.

    High: 75 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Partly cloudy, with a low around 55. Chance of precipitation is 30%.

    Low: 55 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Overnight
A chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 11am. High near 75. Light and variable wind. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
A chance of showers, mainly before 7pm. Patchy dense fog after 9pm. Otherwise, partly cloudy, with a low around 60. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A chance of showers and thunderstorms, mainly after 3pm. Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming east around 5 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms before 8pm, then showers likely between 8pm and 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Sunday
A chance of showers after 2pm. Partly sunny, with a high near 75. Chance of precipitation is 30%.
Sunday Night
A chance of showers before 8pm. Partly cloudy, with a low around 55. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 80.
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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:
2:21 am EDT Aug 20, 2026
Forecast Valid:
3am EDT Aug 20, 2026-6pm EDT Aug 26, 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