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City of Oregon, IllinoisOregon, IL Weather Forecast
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| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
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| Patchy Fog | Patchy Fog | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy |
| Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 851 PM CDT Wed Oct 21 2026 
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Issued: 1200 AM CDT Thu Oct 22 2026
Key Messages
- The dry and unseasonably mild weather will continue through the upcoming weekend.
Discussion
... Issued at 136 PM CDT Wed Oct 21 2026
An anomalously strong mid-level ridge over the central CONUS will anchor omega blocking across much of North America over the next several days. Meanwhile, an elongated surface ridge extending from the Lower Mississippi River Valley to the Canadian Maritimes is in the processes of congealing with another expansive high pressure shifting toward the Upper G...