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Big Run, PA Weather Forecast

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Big Run, PA Weather Forecast

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Big Run PA weather - Overcast - 63°F
Overcast
63°F
Updated 7:27 pm
Feels Like 69°F
Humidity 80%
Wind WSW 5 mph
Barometer  30.08 in
Dew Point 57°F
Big Run PA weather - Overcast - 17°C
Overcast
17°C
Updated 7:27 pm
Feels Like 21°C
Humidity 80%
Wind WSW 8 km/h
Barometer  101.8 kPa
Dew Point 14°C
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Big Run Weather Forecast

TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY
Big Run, PA Weather - Tonight Patchy Fog Big Run, PA Weather - Wednesday Patchy Fog Big Run, PA Weather - Wednesday Night Chance Of Showers Big Run, PA Weather - Thursday Partly Cloudy Big Run, PA Weather - Thursday Night Partly Cloudy Big Run, PA Weather - Friday Chance Of Showers Big Run, PA Weather - Friday Night Chance Of Showers Big Run, PA Weather - Saturday Partly Cloudy Big Run, PA Weather - Saturday Night Chance Of Showers Big Run, PA Weather - Sunday Chance Of Showers Big Run, PA Weather - Sunday Night Partly Cloudy Big Run, PA Weather - Monday Mostly Sunny
Patchy Fog Patchy Fog Chance of Showers Partly Cloudy Partly Cloudy Chance of Showers Chance of Showers Partly Cloudy Chance of Showers Chance of Showers Partly Cloudy Mostly Sunny
Lo: 51°FLo: 11°C Hi: 75°FHi: 24°C
 Lo: 59°FLo: 15°C Hi: 75°FHi: 24°C
 Lo: 61°FLo: 16°C Hi: 75°FHi: 24°C
 Lo: 49°FLo: 9°C Hi: 69°FHi: 21°C
 Lo: 49°FLo: 9°C Hi: 65°FHi: 18°C
 Lo: 45°FLo: 7°C Hi: 61°FHi: 16°C
POP: 20% POP: 90% POP: 90% POP: 30% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 502 PM EDT Tue Sep 29 2026 Big Run, PA Weather - WeatherWorld.com

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Big Run Forecast Discussion

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Issued: 659 PM EDT Tue Sep 29 2026

Key Messages

1) Mainly dry through Thursday, before shower chances return with a Friday cold front

2) Cooler with periodic shower chances for the upcoming weekend


Discussion

... KEY MESSAGE 1... A ridge of high pressure is expected to maintain dry weather for much of the area through Thursday. The exception is Wednesday night, where a weak crossing shortwave and warm advection could result in a few showers north of Pittsburgh. The ridge should strengthen again on Thursday ahead of an approaching tro...