UPPER ST CLAIR, PA 15241 Weather Forecast & Current Conditions

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ALLEGHENY CO. ARPT, PA
Current Weather

10:53 AM EDT MAY 25, 2026
Overcast
66°F
Feels Like: 66°F
Dewpoint: 63°F
Rel. Hum.: 90%
Visibility: 7 miles
Wind: NNW at 3 mph
Pressure: 30.15 inches
Last 72 hours

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UPPER ST CLAIR, PA 15241
Weather Forecast

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THIS AFTERNOON
Cloudy. Highs in the mid 70s. North winds around 5 mph. Gusts up to 20 mph early.
TONIGHT
Mostly cloudy. Patchy fog after midnight. Lows in the upper 50s. Northeast winds around 5 mph.
TUESDAY
Partly sunny. A slight chance of showers in the afternoon. Warm with highs in the lower 80s. East winds around 5 mph, becoming west in the afternoon. Chance of rain 20 percent.
TUESDAY NIGHT
Considerable cloudiness. A chance of showers after midnight. Warm with lows in the mid 60s. West winds around 5 mph in the evening, becoming light and variable. Chance of rain 50 percent.
WEDNESDAY
Mostly cloudy with a chance of showers. Humid with highs in the upper 70s. West winds around 5 mph. Chance of rain 50 percent.
WEDNESDAY NIGHT
Mostly cloudy. A chance of showers in the evening. Lows in the upper 50s. Chance of rain 40 percent.
THURSDAY
Mostly sunny. Highs in the mid 70s.
THURSDAY NIGHT
Mainly clear. Lows in the lower 50s.
FRIDAY
Mostly sunny. Highs in the mid 70s.
FRIDAY NIGHT
Mainly clear. Lows in the lower 50s.
SATURDAY
Mostly sunny. Highs in the mid 70s.
SATURDAY NIGHT
Mainly clear. Lows in the lower 50s.
SUNDAY
Mostly sunny. Highs in the lower 70s.

Visible Weather Satellite
UPPER ST CLAIR, PA 15241
Infrared Weather Satellite
UPPER ST CLAIR, PA 15241
NEXRAD Weather Radar
UPPER ST CLAIR, PA 15241

ALLEGHENY CO. ARPT, PA 3 hourly weather forecast

weather forecast created  7:00 PM CDT  5/24/2026
Monday
25 MAY 2026
UPPER ST CLAIR, PA 15241 weather forecast Day 1, 0 hours 2 AM 65° 65° Mostly Cloudy 73%
RAIN
.5–1 in
0% Thunder
( 16% severe)
S   7 93% 63°
Low 63° UPPER ST CLAIR, PA 15241 weather forecast Day 1, 3 hours 5 AM 64° 64° Mostly Cloudy W   6 93% 62°
High 77° UPPER ST CLAIR, PA 15241 weather forecast Day 1, 6 hours 8 AM 66° 66° Mostly Cloudy 9%

0% Thunder
( 8% severe)
NW   7 87% 62°

Mostly Cloudy



UPPER ST CLAIR, PA 15241 weather forecast Day 1, 9 hours 11 AM 70° 70° Mostly Cloudy N   6 76% 62°
UPPER ST CLAIR, PA 15241 weather forecast Day 1, 12 hours 2 PM 75° 75° Mostly Cloudy 3%

0% Thunder
( 11% severe)
N   6 66% 63°
UPPER ST CLAIR, PA 15241 weather forecast Day 1, 15 hours 5 PM 77° 79° Mostly Cloudy N   6 58% 61°
UPPER ST CLAIR, PA 15241 weather forecast Day 1, 18 hours 8 PM 73° 73° Mostly Cloudy 1%

0% Thunder
( 1% severe)
N   3 66% 61°
UPPER ST CLAIR, PA 15241 weather forecast Day 1, 21 hours 11 PM 66° 66° Mostly Cloudy N   3 75% 58°
Tuesday
26 MAY 2026
UPPER ST CLAIR, PA 15241 weather forecast Day 2, 0 hours 2 AM 62° 63° Partly Cloudy 2%

0% Thunder
( 1% severe)
NA   3 84% 57°
Low 59° UPPER ST CLAIR, PA 15241 weather forecast Day 2, 3 hours 5 AM 60° 60° Mostly Cloudy N   5 87% 56°
High 82° UPPER ST CLAIR, PA 15241 weather forecast Day 2, 6 hours 8 AM 64° 65° Mostly Cloudy 1%

0% Thunder
( 1% severe)
NE   3 81% 58°

Mostly Cloudy



UPPER ST CLAIR, PA 15241 weather forecast Day 2, 9 hours 11 AM 75° 75° Mostly Cloudy ENE   3 64% 62°
UPPER ST CLAIR, PA 15241 weather forecast Day 2, 12 hours 2 PM 80° 81° Partly Cloudy 3%

0% Thunder
( 6% severe)
  CALM 54% 62°
UPPER ST CLAIR, PA 15241 weather forecast Day 2, 15 hours 5 PM 82° 83° Partly Cloudy   CALM 49% 61°
UPPER ST CLAIR, PA 15241 weather forecast Day 2, 18 hours 8 PM 78° 80° Mostly Cloudy 2%

0% Thunder
( 3% severe)
SSE   3 60% 63°
UPPER ST CLAIR, PA 15241 weather forecast Day 2, 21 hours 11 PM 70° 70° Mostly Cloudy ESE   1 73% 61°

ALLEGHENY CO. ARPT, PA extended weather forecast

Wednesday
27 MAY 2026
Thursday
28 MAY 2026
Friday
29 MAY 2026
Saturday
30 MAY 2026
Sunday
31 MAY 2026
Low 64° Low 57° Low 52° Low 51° Low 46°
High 77° High 74° High 73° High 67° High 67°
UPPER ST CLAIR, PA 15241 weather forecast Day 3 UPPER ST CLAIR, PA 15241 weather forecast Day 4 UPPER ST CLAIR, PA 15241 weather forecast Day 5 UPPER ST CLAIR, PA 15241 weather forecast Day 6 UPPER ST CLAIR, PA 15241 weather forecast Day 7
Overcast
52% Rain
Partly Cloudy
18% Rain
Clear
10% Rain
Partly Cloudy
32% Rain
Partly Cloudy
26% Rain
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