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.

Light Rain Fog/Mist

49°F

9°C

Humidity 97%
Wind Speed N 6 mph
Barometer 30.19 in (1022.9 mb)
Dewpoint 48°F (9°C)
Visibility 3.00 mi
Wind Chill46°F (8°C)
Last update 21 May 5:53 am EDT
Extended Forecast for

Arnold PA

  • Today

    Today: Rain likely, mainly before 8am. Cloudy, with a high near 67. Calm wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 67 °F

    Rain Likely
    then Slight
    Chance Rain

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. East wind around 7 mph.

    Low: 52 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of rain after 2pm. Mostly cloudy, with a high near 68. East wind 10 to 14 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 68 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: Rain, mainly after 8pm. Low around 50. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Rain Likely
    then Rain

  • Saturday

    Saturday: Rain and possibly a thunderstorm before 2pm, then showers likely and possibly a thunderstorm after 2pm. High near 64. Southeast wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 64 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 55. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Showers

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

  • Memorial Day

    Memorial Day: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

Detailed Forecast

Today
Rain likely, mainly before 8am. Cloudy, with a high near 67. Calm wind becoming east 5 to 9 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Mostly cloudy, with a low around 52. East wind around 7 mph.
Friday
A chance of rain after 2pm. Mostly cloudy, with a high near 68. East wind 10 to 14 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Rain, mainly after 8pm. Low around 50. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Rain and possibly a thunderstorm before 2pm, then showers likely and possibly a thunderstorm after 2pm. High near 64. Southeast wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 55. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Memorial Day
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Monday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 83. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 61.
Wednesday
Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold PA
 40.57°N 79.76°W (Elev. 860 ft)
Last Update:
6:33 am EDT May 21, 2026
Forecast Valid:
6am EDT May 21, 2026-6pm EDT May 27, 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