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Wcha-Am Chambersburg Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  | | |  | |  |  |  | | | |
| Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Cloudy | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Clearing | Mostly Sunny |
| Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C |
| POP: 60% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 900 PM EDT Sun Aug 23 2026 
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Wcha-Am Chambersburg Forecast Discussion
Issued: 947 PM EDT Sun Aug 23 2026
Key Messages
1) Upper low over the Great Lakes will move southeast tonight then pull off to the northeast Monday. Showers and thunderstorms will move through the northern tier periodically through early Tuesday.
Discussion
... KEY MESSAGE 1: Upper low over the Great Lakes will move southeast tonight then pull off to the northeast Monday. Showers and thunderstorms will move through the northern tier periodically through early Tuesday.
A 70 kt jet max at 500 mb rounding the base of the upper trough ov...