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

67°F

19°C

Humidity 91%
Wind Speed N 3 mph
Barometer 29.96 in (1013.9 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 18 Aug 3:53 am EDT
Extended Forecast for

Arnold PA

  • Today

    Today: Patchy fog before 10am. Otherwise, sunny, with a high near 82. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely after 8pm. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 62. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 50%.

    High: 82 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
Patchy fog before 10am. Otherwise, sunny, with a high near 82. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 61. Calm wind.
Wednesday
A chance of showers and thunderstorms, mainly after 5pm. Increasing clouds, with a high near 82. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms, then showers likely after 8pm. Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 62. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 61.
Saturday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 50%.
Sunday Night
A chance of thunderstorms. Partly cloudy, with a low around 58. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold PA
 40.57°N 79.76°W (Elev. 860 ft)
Last Update:
2:21 am EDT Aug 18, 2026
Forecast Valid:
4am EDT Aug 18, 2026-6pm EDT Aug 24, 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