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Clarion County Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Clear | Mostly Sunny | Clear |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C |
| POP: 20% | POP: 40% | POP: 50% | POP: 70% | POP: 70% | POP: 70% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 223 PM EDT Tue Sep 01 2026 
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Issued: 208 PM EDT Tue Sep 1 2026
Key Messages
1) Additional shower and thunderstorm chances at times through late week, with some possibility for severe storms.
2) Heat and humidity build through Thursday. Heat Advisory issued for Wednesday, September 2.
Discussion
... KEY MESSAGE 1... The 500MB ridge over the central CONUS will shift east as northwest flow sets up over the Great Lakes and into the Upper Ohio Valley. This will set up a series of shortwaves to travel southeast over the region the next few days. The timing of the sho...