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Borough of Cornwall, PACornwall, PA Weather Forecast
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Cornwall Weather Forecast
| TODAY | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  | | | | | | |  | | |  |
| Mostly Sunny | Partly Cloudy | Mostly Sunny | Clearing | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear |
| Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1200 PM EDT Sun Sep 06 2026 
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Issued: 1256 PM EDT Sun Sep 6 2026
Key Messages
1) Pleasant and dry for most through Labor Day
2) Uptick in heat and humidity through midweek
3) Showers, storms, and gusty winds Wednesday night & Thursday
Discussion
... KEY MESSAGE 1: Pleasant and dry for most through Labor Day
In the wake of Saturday`s cold front, a refreshingly low dewpoint airmass has settled in across Pennsylvania and will ensure pleasant conditions through Labor Day. An upper low swirling around in New England will keep upper air temperatures cool enough in PA to ...