Upper St Clair, PA 14 Day Weather - WeatherWorld.com
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Upper St Clair, PA Weather Forecast


Upper St Clair, PA Weather Forecast Dated: 449 PM Thu Sep 03 2026
Expect a mild stretch with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Thursday, September 3, 2026
Mid-Morning
79°F 26°C
Partly Cloudy
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
88°F 31°C
Cloudy
Sizzling hot near 98°F 37°C with a heat index reaching 111°F 44°C, partly cloudy in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds picking up from SW at 6 mph 10 km/h to NNW at 14 mph 23 km/h. Gusts up to 26 mph 41 km/h.
Friday, September 4, 2026
Mid-Morning
68°F 20°C
Cloudy
Mid-Afternoon
77°F 25°C
Nearby Thunderstorms
Early-Evening
79°F 26°C
Nearby Thunderstorms
Comfortable with temperatures reaching 77°F 25°C, locally heavy thunderstorms at times, with lower humidity and steady pressure. Winds switching from the SSW to the NNW at 7 mph 11 km/h. Gusts up to 20 mph 33 km/h.
Saturday, September 5, 2026
Mid-Morning
65°F 18°C
Overcast
Mid-Afternoon
77°F 25°C
Partly Cloudy
Early-Evening
72°F 22°C
Sunny
Enjoyable around 77°F 25°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure.
Sunday, September 6, 2026
Mid-Morning
60°F 15°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
69°F 21°C
Sunny
Mild temperatures up to 74°F 23°C, sunny throughout the day, with lower humidity and steady pressure. Winds ENE at 7 mph 12 km/h.
Monday, September 7, 2026
Mid-Morning
59°F 15°C
Overcast
Mid-Afternoon
74°F 23°C
Overcast
Early-Evening
71°F 22°C
Sunny
Mild with a high of 74°F 23°C, overcast through the afternoon, turning sunny this evening, with lower humidity and steady pressure.
Tuesday, September 8, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
78°F 26°C
Overcast
Early-Evening
73°F 23°C
Overcast
Pleasant near 78°F 26°C, overcast throughout the day, with lower humidity and steady pressure.
Wednesday, September 9, 2026
Mid-Morning
72°F 22°C
Partly Cloudy
Mid-Afternoon
84°F 29°C
Overcast
Early-Evening
82°F 28°C
Partly Cloudy
Balmy with temperatures reaching 84°F 29°C, cloudy throughout the day, with lower humidity and barometric pressure falling. Winds swinging from the SSW to the WSW at 10 mph 16 km/h. Gusts up to 28 mph 45 km/h.
Thursday, September 10, 2026
Mid-Morning
68°F 20°C
Cloudy
Mid-Afternoon
80°F 27°C
Overcast
Early-Evening
75°F 24°C
Partly Cloudy
Quite warm around 80°F 27°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds blowing from the WNW at 10 mph 16 km/h.
Friday, September 11, 2026
Mid-Morning
60°F 16°C
Sunny
Mid-Afternoon
67°F 19°C
Cloudy
Early-Evening
62°F 17°C
Partly Cloudy
Refreshing around 67°F 19°C, cloudy in the morning, overcast in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure.
Saturday, September 12, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
68°F 20°C
Sunny
Mild with a high of 72°F 22°C, partly cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
64°F 18°C
Light Showers
Mid-Afternoon
77°F 25°C
Scattered Showers
Early-Evening
74°F 24°C
Sunny
Pleasant near 77°F 25°C, scattered downpours possible, with increasing humidity and barometric pressure falling.
Monday, September 14, 2026
Mid-Morning
73°F 23°C
Partly Cloudy
Mid-Afternoon
89°F 32°C
Sunny
Early-Evening
82°F 28°C
Sunny
Very warm near 89°F 32°C, though humidity makes it feel like 92°F 33°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds turning from the SSW to the SW at 10 mph 16 km/h. Gusts up to 22 mph 36 km/h.
Tuesday, September 15, 2026
Mid-Morning
68°F 20°C
Scattered Showers
Mid-Afternoon
71°F 21°C
Sunny
Early-Evening
71°F 22°C
Scattered Showers
Enjoyable around 71°F 21°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds switching from the SSW to the WSW at 10 mph 17 km/h. Gusts up to 26 mph 42 km/h.
Wednesday, September 16, 2026
Mid-Morning
55°F 13°C
Scattered Showers
Mid-Afternoon
62°F 16°C
Overcast
Early-Evening
56°F 14°C
Overcast
Mildly cool near 62°F 16°C, scattered downpours possible, with lower humidity and barometric pressure rising. Winds moving from the W to the WNW at 9 mph 15 km/h. Gusts up to 21 mph 33 km/h.
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