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Chambersburg, IL Weather Forecast
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Chambersburg Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
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| Chance of Showers | Chance of Showers | Chance of Showers | Clearing | Sunny | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C |
| POP: 30% | POP: 20% | POP: 20% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 338 AM CDT Mon Sep 21 2026 
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Issued: 330 AM CDT Mon Sep 21 2026
Key Messages
- Scattered showers and thunderstorms will come to an end later this morning.
- Seasonably cool temperatures are expected for the rest of the week.
Aviation
/00Z TAFS THROUGH 06Z TUESDAY/... Issued at 1036 PM CDT Sun Sep 20 2026
Showers and a few thunderstorms will continue to affect the St. Louis area metro terminals through 07-09Z and COU/JEF through 07Z. Heavier showers and thunderstorms will have the potential to reduce ceilings and visibilities to MVFR and IFR conditions. Then mainly I...