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Vergennes, IL Weather Forecast
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Vergennes Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | | | | | |  | | | |
| Partly Cloudy | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy |
| Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 90°FHi: 32°C Lo: 69°FLo: 21°C | Lo: 69°FLo: 21°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 907 PM CDT Sun Sep 13 2026 
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Issued: 639 PM CDT Sun Sep 13 2026
Key Messages
- Another blast of heat is forecast by Tuesday that lasts at least through Thursday. High temperatures will reach the middle to upper 90s with daily peak heat index values potentially up to around the Heat Advisory level threshold of 105 degrees, which begins as early as Monday for some of our Arkansas/Tennessee border counties.
- Small rain chances along with slightly cooler and less humid conditions are expected to arrive by the week`s end.
Discussion
... Issued at 1210 PM CDT Sun Sep 13...