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Bluff Lake, IL Weather Forecast
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Bluff Lake Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY |
 |  | |  |  |  |  | |  | | |
| Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°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: 79°FHi: 26°C Lo: 59°FLo: 15°C |
| POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 902 AM CDT Sat Sep 19 2026 
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Issued: 612 AM CDT Sat Sep 19 2026
Key Messages
- A Heat Advisory remains in effect through early Sunday evening, with high temperatures 15 to 20 degrees above normal in the middle 90s to around 100 degrees both today and Sunday.
- The passage of a cold front will begin a cooling trend Monday, with temperatures by Tuesday finally back down to near to even a little below seasonal normals. Near normal temperatures will then persist through the end of the week.
- The cold front will bring 40-70% chances of showers and storms to our region ...