Riverton, IL Weather Forecast
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Riverton Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
| Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Sunny | Partly Cloudy |
| Hi: 65°FHi: 18°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 122 PM CDT Mon Sep 21 2026 

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Issued: 144 PM CDT Mon Sep 21 2026
Key Messages
- Cooler weather will prevail this week as high temperatures range from the 60s to 70s.
Discussion
... Issued at 144 PM CDT Mon Sep 21 2026
Water vapor imagery early this afternoon shows an upper low spinning over eastern Nebraska/western Iowa with ridging on both sides of it. At the surface, a cold/stationary front is draped from the Mid- Atlantic states westward into Arkansas with high pressure centered over Ontario. Widespread cloud cover will remain in place through at least Tuesday m...
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