St. Clair, PA 14 Day Weather - 17970 WeatherWorld.com
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St. Clair, PA Weather Forecast


St. Clair, PA Weather Forecast Dated: 752 PM Tue Sep 22 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and a stable pattern will dominate.
Tuesday, September 22, 2026
Mid-Morning
49°F 10°C
Drizzle
Mid-Afternoon
52°F 11°C
Overcast
Early-Evening
55°F 13°C
Overcast
Brisk around 52°F 11°C, early showers breaking for a drier afternoon, with lower humidity and steady pressure. Winds turning from the E to the NNE at 3 mph 5 km/h.
Wednesday, September 23, 2026
Mid-Morning
50°F 10°C
Overcast
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
56°F 14°C
Sunny
Mildly cool near 61°F 16°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds blowing from the E at 12 mph 19 km/h. Gusts up to 20 mph 32 km/h.
Thursday, September 24, 2026
Mid-Morning
47°F 8°C
Overcast
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
56°F 13°C
Sunny
Comfortable at 62°F 17°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and barometric pressure falling. Winds moving from the ENE to the NNE at 5 mph 8 km/h.
Friday, September 25, 2026
Mid-Morning
49°F 9°C
Sunny
Mid-Afternoon
66°F 19°C
Sunny
Early-Evening
57°F 14°C
Sunny
Cool with a high near 66°F 19°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the N to the NNW at 7 mph 11 km/h.
Saturday, September 26, 2026
Mid-Morning
51°F 10°C
Overcast
Mid-Afternoon
65°F 18°C
Overcast
Early-Evening
59°F 15°C
Overcast
Refreshing around 65°F 18°C, overcast throughout the day, with lower humidity and steady pressure. Winds blowing from the NNW at 11 mph 17 km/h. Gusts up to 26 mph 42 km/h.
Sunday, September 27, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
60°F 16°C
Cloudy
Mildly cool near 66°F 19°C, cloudy throughout the day, with increasing humidity and steady pressure. Winds N at 11 mph 18 km/h.
Monday, September 28, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
67°F 19°C
Overcast
Early-Evening
60°F 16°C
Overcast
Comfortable at 67°F 19°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with steady humidity and steady pressure.
Tuesday, September 29, 2026
Mid-Morning
58°F 15°C
Partly Cloudy
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
64°F 17°C
Sunny
Enjoyable around 71°F 22°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.
Wednesday, September 30, 2026
Mid-Morning
61°F 16°C
Overcast
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
67°F 20°C
Overcast
Mild temperatures up to 72°F 22°C, overcast throughout the day, with steady humidity and steady pressure.
Thursday, October 1, 2026
Mid-Morning
67°F 20°C
Cloudy
Mid-Afternoon
79°F 26°C
Scattered Showers
Early-Evening
73°F 23°C
Sunny
Mild with a high of 79°F 26°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds out of the W at 8 mph 13 km/h.
Friday, October 2, 2026
Mid-Morning
69°F 21°C
Light Showers
Mid-Afternoon
77°F 25°C
Scattered Showers
Early-Evening
67°F 20°C
Fog
Pleasant near 77°F 25°C, scattered downpours possible, with steady humidity and steady pressure.
Saturday, October 3, 2026
Mid-Morning
62°F 16°C
Scattered Showers
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
68°F 20°C
Sunny
Comfortable with temperatures reaching 72°F 22°C, locally heavy downpours at times, with lower humidity and steady pressure.
Sunday, October 4, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
71°F 22°C
Overcast
Early-Evening
67°F 20°C
Overcast
Enjoyable around 71°F 22°C, overcast throughout the day, with steady humidity and steady pressure.
Monday, October 5, 2026
Mid-Morning
63°F 17°C
Heavy Rain
Mid-Afternoon
62°F 16°C
Light Showers
Early-Evening
58°F 15°C
Overcast
Mildly cool near 62°F 16°C, showers lingering into the afternoon before clearing, with steady humidity and steady pressure. Winds moving from the NNE to the NNW at 13 mph 21 km/h. Gusts up to 31 mph 50 km/h.
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