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Cahokia, IL Weather Forecast
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Cahokia Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  | | | | |  |  |  |
| Mostly Clear | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Mostly Cloudy | Partly Cloudy |
| Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Hi: 81°FHi: 27°C Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C Lo: 69°FLo: 21°C | Lo: 60°FLo: 16°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C |
| POP: 20% | POP: 20% | POP: 20% | POP: 70% | POP: 70% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Fri Sep 18 2026 
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Issued: 1106 PM CDT Thu Sep 17 2026
Key Messages
- Unusually hot and humid conditions will persist through at least Saturday, with the potential to linger into Sunday in some areas. Heat relief is expected early next week.
- A 20-30% chance of showers and weak thunderstorms exists this afternoon and again tomorrow afternoon. However, more substantial (60-80%) rain chances arrive late Saturday through Monday.
Aviation
/00Z TAFS THROUGH 06Z SATURDAY/... Issued at 1050 PM CDT Thu Sep 17 2026
An area of MVFR stratus with bases dropping to bet...