Chesterfield, IL Weather Forecast
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Chesterfield Weather Forecast
| REST OF TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
| Thunderstorms | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Mostly Clear | Clear | Clear | Sunny | Partly Cloudy | Partly Sunny |
| Lo: 69°FLo: 21°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 45°FLo: 7°C | Hi: 60°FHi: 16°C | Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C Lo: 35°FLo: 2°C | Hi: 70°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 71°FHi: 22°C |
| POP: 70% | POP: 80% | POP: 50% | POP: 90% | POP: 80% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Wed Oct 14 2026 

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Issued: 1123 PM CDT Tue Oct 13 2026
Key Messages
- Unseasonable, record-breaking heat ends today.
- Two main rounds of showers and thunderstorms are expected through Thursday: one tonight into Wednesday morning and another late Wednesday night into Thursday morning. There is a low chance of an isolated severe thunderstorm late this evening as well as locally heavy rainfall with both rounds.
- Behind a strong cold front Thursday night, more seasonable temperatures and dry conditions will arrive Friday into the weekend.
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