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Koch School Weather Forecast
| REST OF TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Hi: 69°FHi: 21°C Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C Lo: 59°FLo: 15°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C |
| POP: 20% | POP: 40% | POP: 50% | POP: 70% | POP: 80% | POP: 70% | POP: 70% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1037 AM CDT Fri Sep 18 2026 
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Meteorlogic Glosserator
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Issued: 543 AM CDT Fri Sep 18 2026
Key Messages
- The heart of the hot airmass will shift south of central Illinois today: however, heat index readings will still climb to near 100 degrees along and south of a Jacksonville...to Effingham...to Robinson line this afternoon.
- There is a Marginal Risk (level 1 of 5) for severe weather both Saturday and Sunday as a nearly stationary frontal boundary wavers across the region.
Discussion
... Issued at 314 AM CDT Fri Sep 18 2026
06z/1am surface analysis shows a stationary front extending from j...