Weather WorldUpper St Clair, PA 7-Day Night Weather Forecast
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Upper St Clair, PA Weather Forecast
Upper St Clair, PA Weather Forecast Date: 615 PM EDT Fri Sep 04 2026
The area/counties/county of: Allegheny, including the city of Pittsburgh Metro Area.or toggle through each period.
Tonight... Mostly cloudy. A slight chance of thunderstorms this evening. Patchy fog after midnight. Some thunderstorms May be severe. Warm with lows in the upper 60s. West winds around 5 mph. Chance of precipitation 20%.
Saturday... Mostly cloudy in the morning, then becoming partly sunny. Patchy fog in the morning. A chance of showers. A chance of thunderstorms in the afternoon. Humid with highs around 80. Northwest winds 5 to 10 mph. Chance of rain 50%.
Saturday Night... Mostly cloudy with a chance of showers with a slight chance of thunderstorms in the evening, then partly cloudy after midnight. Lows in the upper 50s. Northeast winds 5 to 10 mph. Chance of rain 50%.
Sunday... Mostly sunny. Highs in the upper 70s. Northeast winds 5 to 10 mph.
Sunday Night... Mainly clear. Lows in the upper 50s. Northeast winds 5 to 10 mph.
Labor Day... Mostly sunny. Highs around 80.
Monday Night... Mainly clear. Lows in the upper 50s.
Tuesday... Partly cloudy. Highs in the lower 80s.
Tuesday Night... Partly cloudy. Warm with lows in the mid 60s.
Wednesday... Partly cloudy in the morning, then becoming partly sunny. Unseasonably warm with highs in the mid 80s.
Wednesday Night... Mostly cloudy with a chance of showers. Warm with lows in the upper 60s. Chance of rain 50%.
Thursday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50%.
Thursday Night... Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the upper 50s. Chance of rain 40%.
POP = Probability of Precipitation
Upper St Clair Radar Loop
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