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Saybrook, IL Weather Forecast
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Saybrook Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Partly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy | Showers Likely | Chance of Showers | Chance of Showers |
| Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C |
| POP: 50% | POP: 70% | POP: 50% | POP: 40% | POP: 50% | POP: 30% | POP: 60% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 412 AM CDT Tue Sep 15 2026 
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Issued: 557 AM CDT Tue Sep 15 2026
Key Messages
- Showers and thunderstorms will track across central Illinois today. For this afternoon and evening, there is a marginal risk (level 1 of 5) that a few storms could produce isolated damaging wind gusts.
- Repeated heavy rainfall today and Wednesday will bring 0.5 to 1.5 inches of rain across most of the area, with isolated swaths of 2 to 3 inches possible near and north of the Illinois River.
- Hot and humid conditions today will drive afternoon heat indices near 100 degrees, primarily al...