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Borough of Irwin, PAIrwin, PA Weather Forecast
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| THIS AFTERNOON | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  | | | | | | | | | |
| Partly Cloudy | Clear | Mostly Sunny | Clear | Sunny | Clear | Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny | Clear |
| Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 40°FLo: 4°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 71°FHi: 22°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C | Lo: 45°FLo: 7°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 223 PM EDT Sun Oct 04 2026 
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Issued: 126 PM EDT Sun Oct 4 2026
Key Messages
1) Quiet and dry weather through the end of the week. Monitor frost potential for tomorrow night. Next chance of rain could be Sunday into Monday.
Discussion
... KEY MESSAGE 1... The large-scale pattern across the Ohio River Valley favors near-seasonable temperatures and generally dry weather, with ridging over the West Coast supporting deep trough across the Great Lakes and East Coast.
Following the passage of a cold front Monday, temperatures could fall into the mid-30s across portion...