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St. Clair PA Weather - Partly Cloudy - 55°F
Partly Cloudy
55°F
Updated 7:52 pm
Feels Like 55°F
Humidity 81%
Wind ENE 7 mph
Barometer  30.34 in
Dew Point 50°F
St. Clair PA Weather - Partly Cloudy - 13°C
Partly Cloudy
13°C
Updated 7:52 pm
Feels Like 13°C
Humidity 81%
Wind ENE 11 km/h
Barometer  102.7 kPa
Dew Point 10°C
St. Clair, PA Weather and Current Conditionsst. clair pa weather forecast

St. Clair, PA Weather Forecast

St. Clair Pennsylvania WeatherSt. Clair, Pennsylvania Weather Weather Forecast
14 day API forecast for St. Clair, Pennsylvania. Note. The 7-day weather forecast for St. Clair, PA is the most reliable and accurate forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days in advance.
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
St. Clair Weather - 2026-09-22 - Morning - Drizzle
49°F 10°C
Drizzle
Mid-Afternoon
St. Clair Weather - 2026-09-22 - Afternoon - Overcast
52°F 11°C
Overcast
Early-Evening
St. Clair Weather - 2026-09-22 - Evening - Overcast
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
St. Clair Weather - 2026-09-23 - Morning - Overcast
50°F 10°C
Overcast
Mid-Afternoon
St. Clair Weather - 2026-09-23 - Afternoon - Sunny
61°F 16°C
Sunny
Early-Evening
St. Clair Weather - 2026-09-23 - Evening - Sunny
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
St. Clair Weather - 2026-09-24 - Morning - Overcast
47°F 8°C
Overcast
Mid-Afternoon
St. Clair Weather - 2026-09-24 - Afternoon - Sunny
62°F 17°C
Sunny
Early-Evening
St. Clair Weather - 2026-09-24 - Evening - Sunny
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
St. Clair Weather - 2026-09-25 - Morning - Sunny
49°F 9°C
Sunny
Mid-Afternoon
St. Clair Weather - 2026-09-25 - Afternoon - Sunny
66°F 19°C
Sunny
Early-Evening
St. Clair Weather - 2026-09-25 - Evening - Sunny
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
St. Clair Weather - 2026-09-26 - Morning - Overcast
51°F 10°C
Overcast
Mid-Afternoon
St. Clair Weather - 2026-09-26 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
St. Clair Weather - 2026-09-26 - Evening - Overcast
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
St. Clair Weather - 2026-09-27 - Morning - Sunny
56°F 13°C
Sunny
Mid-Afternoon
St. Clair Weather - 2026-09-27 - Afternoon - Overcast
66°F 19°C
Overcast
Early-Evening
St. Clair Weather - 2026-09-27 - Evening - Cloudy
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
St. Clair Weather - 2026-09-28 - Morning - Sunny
55°F 13°C
Sunny
Mid-Afternoon
St. Clair Weather - 2026-09-28 - Afternoon - Overcast
67°F 19°C
Overcast
Early-Evening
St. Clair Weather - 2026-09-28 - Evening - Overcast
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
St. Clair Weather - 2026-09-29 - Morning - Partly Cloudy
58°F 15°C
Partly Cloudy
Mid-Afternoon
St. Clair Weather - 2026-09-29 - Afternoon - Sunny
71°F 22°C
Sunny
Early-Evening
St. Clair Weather - 2026-09-29 - Evening - Sunny
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
St. Clair Weather - 2026-09-30 - Morning - Overcast
61°F 16°C
Overcast
Mid-Afternoon
St. Clair Weather - 2026-09-30 - Afternoon - Overcast
72°F 22°C
Overcast
Early-Evening
St. Clair Weather - 2026-09-30 - Evening - Overcast
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
St. Clair Weather - 2026-10-01 - Morning - Cloudy
67°F 20°C
Cloudy
Mid-Afternoon
St. Clair Weather - 2026-10-01 - Afternoon - Scattered Showers
79°F 26°C
Scattered Showers
Early-Evening
St. Clair Weather - 2026-10-01 - Evening - Sunny
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
St. Clair Weather - 2026-10-02 - Morning - Light Showers
69°F 21°C
Light Showers
Mid-Afternoon
St. Clair Weather - 2026-10-02 - Afternoon - Scattered Showers
77°F 25°C
Scattered Showers
Early-Evening
St. Clair Weather - 2026-10-02 - Evening - Fog
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
St. Clair Weather - 2026-10-03 - Morning - Scattered Showers
62°F 16°C
Scattered Showers
Mid-Afternoon
St. Clair Weather - 2026-10-03 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
St. Clair Weather - 2026-10-03 - Evening - Sunny
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
St. Clair Weather - 2026-10-04 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
St. Clair Weather - 2026-10-04 - Afternoon - Overcast
71°F 22°C
Overcast
Early-Evening
St. Clair Weather - 2026-10-04 - Evening - Overcast
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
St. Clair Weather - 2026-10-05 - Morning - Heavy Rain
63°F 17°C
Heavy Rain
Mid-Afternoon
St. Clair Weather - 2026-10-05 - Afternoon - Light Showers
62°F 16°C
Light Showers
Early-Evening
St. Clair Weather - 2026-10-05 - Evening - Overcast
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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Weather by the Numbers

Tue, 22nd
St. Clair PA Weather - Tuesday, Sep 22, 2026 - Patchy Rain Nearby
Hi: 56°F 13°C
Lo: 49°F 10°C
Sunrise 06:52 AM
Sunset 07:02 PM
Wind ENE 5 mph9 km/h
Dew Point 49°F9°C
uv Index 1
Barometric Pressure 30.3 in1026 mb
POP 38% *
Humidity 93%
Wed, 23rd
St. Clair PA Weather - Wednesday, Sep 23, 2026 - Sunny
Hi: 61°F 16°C
Lo: 47°F 8°C
Sunrise 06:53 AM
Sunset 07:00 PM
Wind E 12 mph19 km/h
Dew Point 39°F4°C
uv Index 5
Barometric Pressure 30.45 in1031 mb
POP 2% *
Humidity 51%
Thu, 24th
St. Clair PA Weather - Thursday, Sep 24, 2026 - Partly Cloudy
Hi: 62°F 17°C
Lo: 42°F 6°C
Sunrise 06:54 AM
Sunset 06:58 PM
Wind ENE 9 mph15 km/h
Dew Point 36°F2°C
uv Index 5
Barometric Pressure 30.42 in1030 mb
POP 4% *
Humidity 45%
Fri, 25th
St. Clair PA Weather - Friday, Sep 25, 2026 - Sunny
Hi: 66°F 19°C
Lo: 42°F 5°C
Sunrise 06:55 AM
Sunset 06:57 PM
Wind N 11 mph18 km/h
Dew Point 37°F3°C
uv Index 5
Barometric Pressure 30.15 in1021 mb
POP 1% *
Humidity 40%
Sat, 26th
St. Clair PA Weather - Saturday, Sep 26, 2026 - Overcast
Hi: 65°F 18°C
Lo: 46°F 8°C
Sunrise 06:56 AM
Sunset 06:55 PM
Wind NNW 11 mph18 km/h
Dew Point 45°F7°C
uv Index 4
Barometric Pressure 30.03 in1017 mb
POP 12% *
Humidity 52%
Sun, 27th
St. Clair PA Weather - Sunday, Sep 27, 2026 - Partly Cloudy
Hi: 67°F 19°C
Lo: 53°F 12°C
Sunrise 06:57 AM
Sunset 06:53 PM
Wind SW 13 mph20 km/h
Dew Point 45°F7°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 4% *
Humidity 54%
Mon, 28th
St. Clair PA Weather - Monday, Sep 28, 2026 - Sunny
Hi: 68°F 20°C
Lo: 50°F 10°C
Sunrise 06:58 AM
Sunset 06:52 PM
Wind NNW 6 mph10 km/h
Dew Point 49°F9°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 3% *
Humidity 59%
Tue, 29th
St. Clair PA Weather - Tuesday, Sep 29, 2026 - Sunny
Hi: 71°F 22°C
Lo: 53°F 12°C
Sunrise 06:59 AM
Sunset 06:50 PM
Wind NNW 3 mph4 km/h
Dew Point 52°F11°C
uv Index 5
Barometric Pressure 30.12 in1020 mb
POP 4% *
Humidity 58%
Wed, 30th
St. Clair PA Weather - Wednesday, Sep 30, 2026 - Overcast
Hi: 72°F 22°C
Lo: 56°F 13°C
Sunrise 07:00 AM
Sunset 06:48 PM
Wind SSW 7 mph11 km/h
Dew Point 53°F12°C
uv Index 5
Barometric Pressure 30.15 in1021 mb
POP 14% *
Humidity 59%
Thu, 1st
St. Clair PA Weather - Thursday, Oct 1, 2026 - Partly Cloudy
Hi: 80°F 26°C
Lo: 62°F 16°C
Sunrise 07:01 AM
Sunset 06:47 PM
Wind W 8 mph13 km/h
Dew Point 60°F16°C
uv Index 6
Barometric Pressure 30.09 in1019 mb
POP 9% *
Humidity 58%
Fri, 2nd
St. Clair PA Weather - Friday, Oct 2, 2026 - Light Rain Shower
Hi: 78°F 26°C
Lo: 61°F 16°C
Sunrise 07:02 AM
Sunset 06:45 PM
Wind SW 4 mph6 km/h
Dew Point 63°F17°C
uv Index 5
Barometric Pressure 30.06 in1018 mb
POP 47% *
Humidity 67%
Sat, 3rd
St. Clair PA Weather - Saturday, Oct 3, 2026 - Cloudy
Hi: 73°F 23°C
Lo: 60°F 15°C
Sunrise 07:03 AM
Sunset 06:43 PM
Wind SSE 7 mph12 km/h
Dew Point 59°F15°C
uv Index 4
Barometric Pressure 30.09 in1019 mb
POP 15% *
Humidity 75%
Sun, 4th
St. Clair PA Weather - Sunday, Oct 4, 2026 - Overcast
Hi: 71°F 22°C
Lo: 61°F 16°C
Sunrise 07:04 AM
Sunset 06:42 PM
Wind SSE 7 mph11 km/h
Dew Point 60°F15°C
uv Index 4
Barometric Pressure 30.09 in1019 mb
POP 21% *
Humidity 77%
Mon, 5th
St. Clair PA Weather - Monday, Oct 5, 2026 - Light Rain Shower
Hi: 64°F 18°C
Lo: 53°F 12°C
Sunrise 07:06 AM
Sunset 06:40 PM
Wind SE 12 mph19 km/h
Dew Point 62°F17°C
uv Index 4
Barometric Pressure 29.71 in1006 mb
POP 92% *
Humidity 98%
* POP = Probability of Precipitation. Data for 12:00 PM.