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Upper St Clair, PA Weather Forecast
Upper St Clair, PA Weather Forecast Dated: 821 AM Tue Oct 20 2026
Expect a cool pattern with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and a stable pattern will dominate.
Tuesday, October 20, 2026
Mid-Morning
47°F 8°C
Sunny
Mid-Afternoon
66°F 19°C
Partly Cloudy
Early-Evening
55°F 13°C
Sunny
Refreshing around 66°F 19°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure.
Wednesday, October 21, 2026
Mid-Morning
47°F 9°C
Sunny
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
53°F 12°C
Sunny
Mildly cool near 65°F 18°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Thursday, October 22, 2026
Mid-Morning
46°F 8°C
Sunny
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
53°F 12°C
Sunny
Comfortable at 63°F 17°C, sunny throughout the day, with steady humidity and steady pressure.
Friday, October 23, 2026
Mid-Morning
47°F 8°C
Sunny
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
51°F 11°C
Sunny
Cool with a high near 63°F 17°C, sunny throughout the day, with lower humidity and steady pressure.
Saturday, October 24, 2026
Mid-Morning
45°F 7°C
Overcast
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
53°F 12°C
Sunny
Refreshing around 65°F 18°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure.
Sunday, October 25, 2026
Mid-Morning
48°F 9°C
Partly Cloudy
Mid-Afternoon
67°F 19°C
Partly Cloudy
Early-Evening
58°F 15°C
Overcast
Mildly cool near 67°F 19°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Monday, October 26, 2026
Mid-Morning
51°F 11°C
Overcast
Mid-Afternoon
67°F 19°C
Overcast
Early-Evening
58°F 15°C
Overcast
Comfortable at 67°F 19°C, overcast throughout the day, with steady humidity and barometric pressure falling.
Tuesday, October 27, 2026
Mid-Morning
52°F 11°C
Partly Cloudy
Mid-Afternoon
58°F 14°C
Scattered Showers
Early-Evening
48°F 9°C
Overcast
Cool with a high near 58°F 14°C, scattered downpours possible, with increasing humidity and steady pressure. Winds turning from the SW to the NW at 9 mph 15 km/h.
Wednesday, October 28, 2026
Mid-Morning
38°F 4°C
Scattered Showers
Mid-Afternoon
46°F 8°C
Sunny
Early-Evening
39°F 4°C
Sunny
Brisk around 46°F 8°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds blowing from the NW at 8 mph 13 km/h.
Thursday, October 29, 2026
Mid-Morning
31°F 0°C
Sunny
Mid-Afternoon
47°F 8°C
Sunny
Early-Evening
39°F 4°C
Sunny
Cool and brisk at 47°F 8°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds WSW at 12 mph 19 km/h. Gusts up to 23 mph 37 km/h.
Friday, October 30, 2026
Mid-Morning
37°F 3°C
Overcast
Mid-Afternoon
43°F 6°C
Scattered Showers
Early-Evening
41°F 5°C
Overcast
Biting cold near 43°F 6°C, scattered downpours possible, with steady humidity and steady pressure.
Saturday, October 31, 2026
Mid-Morning
41°F 5°C
Scattered Showers
Mid-Afternoon
44°F 6°C
Scattered Showers
Early-Evening
44°F 7°C
Light Fog
Cold with a high near 44°F 6°C, locally heavy downpours at times, with steady humidity and steady pressure.
Sunday, November 1, 2026
Mid-Morning
44°F 7°C
Light Fog
Mid-Afternoon
51°F 11°C
Sunny
Early-Evening
42°F 6°C
Sunny
Brisk around 51°F 11°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.
Monday, November 2, 2026
Mid-Morning
39°F 4°C
Overcast
Mid-Afternoon
49°F 9°C
Overcast
Early-Evening
41°F 5°C
Overcast
Cool and brisk at 49°F 9°C, overcast through the afternoon, turning cloudy this evening, with steady humidity and barometric pressure falling.
Upper St Clair, PA Weather Radar Map
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