Upper St Clair, PA Weather Forecast
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Upper St Clair Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
| Clear | Sunny | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Clear | Partly Cloudy | Partly Cloudy | Partly Sunny | Partly Cloudy | Mostly Sunny |
| Lo: 39°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 39°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 39°FLo: 4°C | Hi: 69°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 607 PM EDT Fri Oct 23 2026 

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Issued: 640 PM EDT Fri Oct 23 2026
Key Messages
1) Above normal temperature with dry weather highly likely until at least late next week.
Discussion
... KEY MESSAGE 1... Ensemble model analysis remains firm on upper ridging and surface high pressure dominating the weather pattern over the upper Ohio River Valley for much of the next week plus. Any daily variations arise from shifts on the center placement of the high and/or passage of shortwaves north of the region. The result is consistently above normal temperature (ranging from a...
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