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Billet Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  | | | | | |  |  | |
| Sunny | Chance of T-Storm | Chance of T-Storm | Clearing | Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 70°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 70°FLo: 21°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C |
| POP: 40% | POP: 30% | POP: 30% | 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...