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Fay, IL Weather Forecast
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| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  | |  | | |  |  | | |
| Mostly Clear | Chance of T-Storm | Chance of Showers | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Sunny | Chance of Showers | Partly Sunny | Chance of Showers | Mostly Sunny |
| Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C |
| POP: 20% | POP: 40% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 541 PM CDT Thu Sep 03 2026 
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Issued: 654 PM CDT Thu Sep 3 2026
Key Messages
- Very hot and humid weather will continue through the end of the week and into the weekend, with peak heat index values between 100-110, especially for areas along and south of Highway 30.
- Precipitation chances will remain limited for many, with best chances north of Interstate 80 through the end of the work week.
- Temperatures and humidity will trend upwards again through the middle of next week, resulting in heat indices nearing 100. A more active pattern may also take shape, leading...