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Upper St Clair, PA 7-Day Weather Forecast
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Upper St Clair Weather Forecast
Upper St Clair, PA Weather Forecast Date: 1133 PM EDT Thu Sep 03 2026
Weather forecast for Upper St Clair, PA
Tonight Lo: 70°F Lo: 21°C |
Tonight... Mostly cloudy. A slight chance of showers late this evening, then a chance of showers and thunderstorms. Warm. Near steady temperature in the lower 70s. South winds around 5 mph, becoming southwest. Chance of rain 40%. |
Fri Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Friday... Partly sunny with a slight chance of showers and thunderstorms in the morning, then mostly cloudy with showers likely with a chance of thunderstorms in the afternoon. Warm with highs in the mid 80s. West winds 5 to 10 mph. Chance of rain 70%. |
| Sat Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Saturday... Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A chance of thunderstorms, mainly in the morning. Humid with highs around 80. Northwest winds around 5 mph. Chance of rain 50%. |
Sun Hi: 79°FHi: 26°C Lo: 59°F Lo: 15°C |
Sunday... Mostly sunny. Highs in the upper 70s. |
| Labor Day Hi: 80°FHi: 27°C Lo: 59°F Lo: 15°C |
Labor Day... Mostly sunny. Highs around 80. |
Tue Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Tuesday... Partly sunny. Highs in the lower 80s. |
Wed Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Wednesday... Partly sunny. A chance of showers in the morning. Warm with highs in the mid 80s. Chance of rain 30%. |
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