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| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
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| Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Lo: 70°FLo: 21°C | Hi: 95°FHi: 35°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1237 AM CDT Tue Sep 15 2026 
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Issued: 1213 AM CDT Tue Sep 15 2026
Key Messages
- After a brief respite, temperatures will again run well above normal the remainder of the week. Per LREF ensembles, probabilities of high temperatures above 95 degrees are generally 40-60% in areas south of I-70 through the upcoming weekend.
- An incoming cold front will stall over central Illinois, with periods of showers and thunderstorms Tuesday and Wednesday. There is a low (5-15%) probability of damaging winds with the storms Tuesday afternoon and evening.
Discussion
... Issued at 2...