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Chambersburg Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Clouds | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Showers Likely | Showers Likely | Chance of Showers |
| Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C |
| POP: 50% | POP: 50% | POP: 60% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 823 PM EDT Sat Oct 31 2026 
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Issued: 657 PM EDT Sat Oct 31 2026
Key Messages
1) Dry weather and above normal temperatures favored through the middle of next week before rain chances return.
Discussion
... KEY MESSAGE 1... Eastern CONUS surface high pressure remains the dominant weather feature as it promotes dry weather and above normal temperature this weekend into early next week. For those Trick- or-Treating tonight, this means temperatures hovering the 50s to lower 60s with a slower nighttime cool off thanks to cirrus clouds aloft. Warm advection to start t...