Weather WorldUpper Bluff Lake, IL Weather Forecast
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Upper Bluff Lake Weather Forecast
| OVERNIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SUNDAY | SUNDAY NIGHT | MONDAY |
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| Mostly Cloudy | Partly Sunny | Partly Cloudy | Partly Sunny | Clearing | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 212 AM CDT Tue Sep 22 2026 
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Issued: 239 AM CDT Tue Sep 22 2026
Key Messages
- Happy Astronomical Fall! Cooler, more seasonable temps are expected today with highs in the mid 70s to lower 80s. Dry conditions expected into the weekend.
- Temps will potentially warm up again into the mid-upper 80s to start next work week.
Discussion
... Issued at 238 AM CDT Tue Sep 22 2026
Low pressure aloft slides through the region today and tonight and then passes east tomorrow. Sfc high pressure continues to build with cool NE winds today. Highs will be much cooler and more Fall l...