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Upper St Clair PA Weather - Clear - 87°F
Clear
87°F
Updated 4:49 pm
Feels Like 109°F
Humidity 60%
Wind SW 10 mph
Barometer  29.97 in
Dew Point 72°F
Upper St Clair PA Weather - Clear - 31°C
Clear
31°C
Updated 4:49 pm
Feels Like 43°C
Humidity 60%
Wind SW 16 km/h
Barometer  101.5 kPa
Dew Point 22°C
Upper St Clair, PA Weather and Current Conditionsupper st clair pa weather forecast

Upper St Clair, PA Weather Forecast

Upper St Clair Pennsylvania WeatherUpper St Clair, Pennsylvania Weather Weather Forecast
14 day API forecast for Upper St Clair, Pennsylvania. Note. The 7-day weather forecast for Upper 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.
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
Upper St Clair Weather - 2026-09-03 - Morning - Partly Cloudy
79°F 26°C
Partly Cloudy
Mid-Afternoon
Upper St Clair Weather - 2026-09-03 - Afternoon - Sunny
98°F 37°C
Sunny
Early-Evening
Upper St Clair Weather - 2026-09-03 - Evening - Cloudy
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
Upper St Clair Weather - 2026-09-04 - Morning - Cloudy
68°F 20°C
Cloudy
Mid-Afternoon
Upper St Clair Weather - 2026-09-04 - Afternoon - Nearby Thunderstorms
77°F 25°C
Nearby Thunderstorms
Early-Evening
Upper St Clair Weather - 2026-09-04 - Evening - Nearby Thunderstorms
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
Upper St Clair Weather - 2026-09-05 - Morning - Overcast
65°F 18°C
Overcast
Mid-Afternoon
Upper St Clair Weather - 2026-09-05 - Afternoon - Partly Cloudy
77°F 25°C
Partly Cloudy
Early-Evening
Upper St Clair Weather - 2026-09-05 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-06 - Morning - Sunny
60°F 15°C
Sunny
Mid-Afternoon
Upper St Clair Weather - 2026-09-06 - Afternoon - Sunny
74°F 23°C
Sunny
Early-Evening
Upper St Clair Weather - 2026-09-06 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-07 - Morning - Overcast
59°F 15°C
Overcast
Mid-Afternoon
Upper St Clair Weather - 2026-09-07 - Afternoon - Overcast
74°F 23°C
Overcast
Early-Evening
Upper St Clair Weather - 2026-09-07 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-08 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
Upper St Clair Weather - 2026-09-08 - Afternoon - Overcast
78°F 26°C
Overcast
Early-Evening
Upper St Clair Weather - 2026-09-08 - Evening - Overcast
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
Upper St Clair Weather - 2026-09-09 - Morning - Partly Cloudy
72°F 22°C
Partly Cloudy
Mid-Afternoon
Upper St Clair Weather - 2026-09-09 - Afternoon - Overcast
84°F 29°C
Overcast
Early-Evening
Upper St Clair Weather - 2026-09-09 - Evening - Partly Cloudy
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
Upper St Clair Weather - 2026-09-10 - Morning - Cloudy
68°F 20°C
Cloudy
Mid-Afternoon
Upper St Clair Weather - 2026-09-10 - Afternoon - Overcast
80°F 27°C
Overcast
Early-Evening
Upper St Clair Weather - 2026-09-10 - Evening - Partly Cloudy
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
Upper St Clair Weather - 2026-09-11 - Morning - Sunny
60°F 16°C
Sunny
Mid-Afternoon
Upper St Clair Weather - 2026-09-11 - Afternoon - Cloudy
67°F 19°C
Cloudy
Early-Evening
Upper St Clair Weather - 2026-09-11 - Evening - Partly Cloudy
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
Upper St Clair Weather - 2026-09-12 - Morning - Sunny
55°F 13°C
Sunny
Mid-Afternoon
Upper St Clair Weather - 2026-09-12 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
Upper St Clair Weather - 2026-09-12 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-13 - Morning - Light Showers
64°F 18°C
Light Showers
Mid-Afternoon
Upper St Clair Weather - 2026-09-13 - Afternoon - Scattered Showers
77°F 25°C
Scattered Showers
Early-Evening
Upper St Clair Weather - 2026-09-13 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-14 - Morning - Partly Cloudy
73°F 23°C
Partly Cloudy
Mid-Afternoon
Upper St Clair Weather - 2026-09-14 - Afternoon - Sunny
89°F 32°C
Sunny
Early-Evening
Upper St Clair Weather - 2026-09-14 - Evening - Sunny
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
Upper St Clair Weather - 2026-09-15 - Morning - Scattered Showers
68°F 20°C
Scattered Showers
Mid-Afternoon
Upper St Clair Weather - 2026-09-15 - Afternoon - Sunny
71°F 21°C
Sunny
Early-Evening
Upper St Clair Weather - 2026-09-15 - Evening - Scattered Showers
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
Upper St Clair Weather - 2026-09-16 - Morning - Scattered Showers
55°F 13°C
Scattered Showers
Mid-Afternoon
Upper St Clair Weather - 2026-09-16 - Afternoon - Overcast
62°F 16°C
Overcast
Early-Evening
Upper St Clair Weather - 2026-09-16 - Evening - Overcast
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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Weather by the Numbers

Thu, 3rd
Upper St Clair PA Weather - Thursday, Sep 3, 2026 - Sunny
Hi: 98°F 37°C
Lo: 73°F 23°C
Sunrise 06:50 AM
Sunset 07:49 PM
Wind WSW 9 mph14 km/h
Dew Point 75°F24°C
uv Index 7
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 63%
Fri, 4th
Upper St Clair PA Weather - Friday, Sep 4, 2026 - Light Rain Shower
Hi: 82°F 28°C
Lo: 67°F 19°C
Sunrise 06:51 AM
Sunset 07:48 PM
Wind WSW 9 mph14 km/h
Dew Point 68°F20°C
uv Index 4
Barometric Pressure 29.94 in1014 mb
POP 21% *
Humidity 65%
Sat, 5th
Upper St Clair PA Weather - Saturday, Sep 5, 2026 - Overcast
Hi: 78°F 25°C
Lo: 63°F 17°C
Sunrise 06:52 AM
Sunset 07:46 PM
Wind N 4 mph6 km/h
Dew Point 54°F12°C
uv Index 4
Barometric Pressure 29.97 in1015 mb
POP 12% *
Humidity 53%
Sun, 6th
Upper St Clair PA Weather - Sunday, Sep 6, 2026 - Sunny
Hi: 74°F 23°C
Lo: 57°F 14°C
Sunrise 06:53 AM
Sunset 07:44 PM
Wind ENE 9 mph14 km/h
Dew Point 52°F11°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 2% *
Humidity 52%
Mon, 7th
Upper St Clair PA Weather - Monday, Sep 7, 2026 - Overcast
Hi: 75°F 24°C
Lo: 58°F 14°C
Sunrise 06:54 AM
Sunset 07:43 PM
Wind ENE 6 mph9 km/h
Dew Point 54°F12°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 13% *
Humidity 55%
Tue, 8th
Upper St Clair PA Weather - Tuesday, Sep 8, 2026 - Overcast
Hi: 79°F 26°C
Lo: 58°F 15°C
Sunrise 06:55 AM
Sunset 07:41 PM
Wind ENE 3 mph4 km/h
Dew Point 52°F11°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 12% *
Humidity 51%
Wed, 9th
Upper St Clair PA Weather - Wednesday, Sep 9, 2026 - Partly Cloudy
Hi: 85°F 30°C
Lo: 68°F 20°C
Sunrise 06:56 AM
Sunset 07:39 PM
Wind WSW 10 mph17 km/h
Dew Point 63°F17°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 5% *
Humidity 56%
Thu, 10th
Upper St Clair PA Weather - Thursday, Sep 10, 2026 - Overcast
Hi: 81°F 27°C
Lo: 65°F 18°C
Sunrise 06:57 AM
Sunset 07:38 PM
Wind W 9 mph15 km/h
Dew Point 57°F14°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 10% *
Humidity 52%
Fri, 11th
Upper St Clair PA Weather - Friday, Sep 11, 2026 - Overcast
Hi: 69°F 21°C
Lo: 56°F 13°C
Sunrise 06:57 AM
Sunset 07:36 PM
Wind NW 8 mph13 km/h
Dew Point 47°F8°C
uv Index 4
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 51%
Sat, 12th
Upper St Clair PA Weather - Saturday, Sep 12, 2026 - Sunny
Hi: 73°F 23°C
Lo: 52°F 11°C
Sunrise 06:58 AM
Sunset 07:34 PM
Wind NE 5 mph8 km/h
Dew Point 41°F5°C
uv Index 5
Barometric Pressure 30.06 in1018 mb
POP 1% *
Humidity 42%
Sun, 13th
Upper St Clair PA Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 78°F 26°C
Lo: 59°F 15°C
Sunrise 06:59 AM
Sunset 07:33 PM
Wind ESE 4 mph6 km/h
Dew Point 49°F9°C
uv Index 6
Barometric Pressure 30.09 in1019 mb
POP 36% *
Humidity 44%
Mon, 14th
Upper St Clair PA Weather - Monday, Sep 14, 2026 - Sunny
Hi: 89°F 32°C
Lo: 68°F 20°C
Sunrise 07:00 AM
Sunset 07:31 PM
Wind SW 8 mph13 km/h
Dew Point 65°F18°C
uv Index 7
Barometric Pressure 29.97 in1015 mb
POP 4% *
Humidity 55%
Tue, 15th
Upper St Clair PA Weather - Tuesday, Sep 15, 2026 - Patchy Rain Nearby
Hi: 76°F 25°C
Lo: 65°F 18°C
Sunrise 07:01 AM
Sunset 07:29 PM
Wind SW 13 mph21 km/h
Dew Point 66°F19°C
uv Index 5
Barometric Pressure 29.65 in1004 mb
POP 40% *
Humidity 93%
Wed, 16th
Upper St Clair PA Weather - Wednesday, Sep 16, 2026 - Patchy Rain Nearby
Hi: 63°F 17°C
Lo: 53°F 11°C
Sunrise 07:02 AM
Sunset 07:28 PM
Wind W 13 mph22 km/h
Dew Point 45°F7°C
uv Index 4
Barometric Pressure 29.85 in1011 mb
POP 10% *
Humidity 54%
* POP = Probability of Precipitation. Data for 12:00 PM.