Saint Clair, Pennsylvania Weather
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Weather Forecast for Saint Clair, Pennsylvania : Westmoreland County
Issued: 7:03 pm EDT Sep 4, 2025 Latitude: 40.2686808 Longitude: -79.548373 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
20% chance of rain on Tonight Mostly Cloudy on Friday 80% chance of thunderstorms on Saturday Mostly Sunny on Sunday Morning Fog on Monday Sunny on Tuesday Sunny on Wednesday Sunny on Thursday
Low: 57°F High: 81°F High: 66°F High: 68°F High: 69°F High: 74°F High: 77°F High: 77°F
Low: 57°F Low: 48°F Low: 44°F Low: 44°F Low: 48°F Low: 50°F  
Rain Mostly Cloudy Thunderstorms Mostly Sunny Morning Fog Sunny Sunny Sunny
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Current Conditions at
LATROBE - (KLBE)
61°
Cloudy
Light Rain Mist
as of 7:50 PM EDST
Rel. Humidity: 100%
Dew Point: 61°F
Visibility: 6 Miles
Pressure: 29.83 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Broken at 1600ft, Broken at 2900ft, Solid Overcast at 4000ft
Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
61°
Mostly Cloudy
Mist
as of 8:34 PM EDST
Rel. Humidity: 100%
Dew Point: 61°F
Visibility: 4 Miles
Pressure: 29.81 in.
Flight Rule: MVFR
Wind Data
5 MPH
160° South
Cloud Level(s): Few at 100ft, Broken at 7000ft
Current Conditions at
STEWART FIELD - (KIDI)
59°
Cloudy
as of 8:35 PM EDST
Rel. Humidity: 100%
Dew Point: 59°F
Visibility: 9 Miles
Pressure: 29.84 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Scattered at 800ft, Solid Overcast at 1400ft
Current Conditions at
JOHNSTOWN - (KJST)
57°
Cloudy
Light Rain
as of 8:01 PM EDST
Rel. Humidity: 93%
Dew Point: 55°F
Visibility: 9 Miles
Pressure: 29.84 in.
Flight Rule: MVFR
Wind Data
6 MPH
290° West
Cloud Level(s): Scattered at 900ft, Broken at 2500ft, Solid Overcast at 3100ft
20% chance of rain Tonight Tonight... A slight chance of showers before 11pm. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 57. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Mostly Cloudy on Friday Friday... Mostly cloudy, then gradually becoming sunny, with a high near 81. Southwest wind 7 to 15 mph.
80% chance of thunderstorms Friday Night Friday Night... Showers and thunderstorms likely, then showers after 2am. Low around 57. South wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
80% chance of thunderstorms Saturday Saturday... Showers before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. High near 66. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
30% chance of rain Saturday Night Saturday Night... A chance of showers or sprinkles before 8pm, then a chance of sprinkles between 8pm and 2am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 48. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 68.
Morning Fog on Sunday Night Sunday Night... Patchy fog after 1am. Otherwise, mostly clear, with a low around 44.
Morning Fog on Monday Monday... Areas of fog before 9am. Otherwise, sunny, with a high near 69.
Morning Fog on Monday Night Monday Night... Patchy fog after 2am. Otherwise, mostly clear, with a low around 44.
Sunny on Tuesday Tuesday... Sunny, with a high near 74.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 48.
Sunny on Wednesday Wednesday... Sunny, with a high near 77.
Patchy Fog on Wednesday Night Wednesday Night... Patchy fog. Otherwise, mostly clear, with a low around 50.
Sunny on Thursday Thursday... Sunny, with a high near 77.
Current Radar Image


Sun Almanac for Saint Clair, Pennsylvania
Sunrise: 06:49 AM
Sunset: 7:45 PM
Civil Sunrise:06:21 AM
Civil Sunset: 8:13 PM
Nautical Sunrise: 05:49 AM
Nautical Sunset: 8:46 PM
Astro Sunrise: 05:14 AM
Astro Sunset: 9:20 PM
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