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Upper Saint Clair, Pennsylvania Weather Forecast
Upper Saint Clair, Pennsylvania Weather
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Weather Forecast for Upper Saint Clair, Pennsylvania : Allegheny County
Issued: 6:14 pm EST Jan 22, 2026 Latitude: 40.3359029 Longitude: -80.083388 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
Partly Cloudy on Tonight Mostly Sunny on Friday 20% chance of snow on Saturday 100% chance of snow on Sunday 50% chance of snow on Monday Partly Sunny on Tuesday 40% chance of snow on Wednesday 30% chance of snow on Thursday
Low: 18°F High: 12 °F High: 14°F High: 25°F High: 18°F High: 18°F High: 22°F High: 17°F
Low: 0 °F Low: 11°F Low: 13°F Low: -1°F Low: 9°F Low: 6 °F  
Partly Cloudy Mostly Sunny Snow Snow Snow Partly Sunny Snow Snow
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Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
28°
Feels like 18°F
Clear
as of 6:53 PM EST
Rel. Humidity: 39%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.12 in.
Flight Rule: VFR
Wind Data
12 MPH
250° West
Cloud Level(s): Clear
Current Conditions at
PITTSBURGH - (KPIT)
28°
Feels like 19°F
Mostly Cloudy
as of 6:51 PM EST
Rel. Humidity: 39%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
10 MPH
240° Southwest
Cloud Level(s): Broken at 22000ft
Current Conditions at
WASHINGTON - (KAFJ)
28°
Clear
as of 6:56 PM EST
Rel. Humidity: 46%
Dew Point: 10°F
Visibility: 10 Miles
Pressure: 30.17 in.
Flight Rule: VFR
Wind Data
8 MPH
250° West
Cloud Level(s): Clear
Current Conditions at
BUTLER COUNTY - (KBTP)
27°
Feels like 15°F
Clear
as of 6:56 PM EST
Rel. Humidity: 45%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
13 MPH
240° Southwest
Cloud Level(s): Clear
Partly Cloudy on Tonight Tonight... Cloudy, then gradually becoming partly cloudy, with a low around 18. Southwest wind around 9 mph.
Mostly Sunny on Friday Friday... Mostly sunny, with a temperature falling to around 12 by 5pm. Wind chill values as low as -3. West wind 10 to 16 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 0. Wind chill values as low as -9. Northwest wind 5 to 11 mph.
20% chance of snow Saturday Saturday... A slight chance of snow after 1pm. Mostly cloudy and cold, with a high near 14. Wind chill values as low as -7. Northeast wind 3 to 8 mph. Chance of precipitation is 20%.
90% chance of snow Saturday Night Saturday Night... Snow. Low around 11. East wind around 9 mph. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.
100% chance of snow Sunday Sunday... Snow. The snow could be heavy at times. High near 25. Chance of precipitation is 100%.
90% chance of snow Sunday Night Sunday Night... Snow. Low around 13. Chance of precipitation is 90%.
50% chance of snow Monday Monday... A chance of snow. Mostly cloudy, with a high near 18. Chance of precipitation is 50%.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around -1.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 18.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 9.
40% chance of snow Wednesday Wednesday... A chance of snow. Mostly cloudy, with a high near 22. Chance of precipitation is 40%.
40% chance of snow Wednesday Night Wednesday Night... A chance of snow. Mostly cloudy, with a low around 6. Chance of precipitation is 40%.
30% chance of snow Thursday Thursday... A chance of snow. Mostly cloudy, with a high near 17. Chance of precipitation is 30%.
Current Radar Image


Sun Almanac for Upper Saint Clair, Pennsylvania
Sunrise: 07:37 AM
Sunset: 5:27 PM
Civil Sunrise:07:08 AM
Civil Sunset: 5:56 PM
Nautical Sunrise: 06:35 AM
Nautical Sunset: 6:29 PM
Astro Sunrise: 06:02 AM
Astro Sunset: 7:02 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.