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John Leigh Grammar School, IL Weather Forecast
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John Leigh Grammar School Weather Forecast
| EARLY THIS MORNING | TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 | |  | |  |  | | | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy |
| Hi: 71°FHi: 22°C | Hi: 81°FHi: 27°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C |
| POP: 70% | POP: 90% | POP: 40% | POP: 40% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 311 AM CDT Sat Aug 15 2026 
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Issued: 123 AM CDT Sat Aug 15 2026
Key Messages
- There is a threat for significant flash flooding tonight primarily near and south of Interstate 80. Rainfall amounts in this area could exceed 3-4 inches in places.
- Additional period of showers and thunderstorms Saturday night into Sunday with a cold front.
- A brief break in the stormy pattern is expected Monday into Tuesday before another storm system moves through towards midweek.