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Dennis Lake, IL Weather Forecast
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Dennis Lake Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  | |  | |  |  | |  | | | |
| Sunny | Chance of T-Storm | Sunny | Clear | Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Partly Cloudy | Partly Sunny | Mostly Clear | Mostly Clear |
| Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 601 AM CDT Fri Aug 21 2026 
Dennis Lake Radar Loop
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Dennis Lake Forecast Discussion
Issued: 626 AM CDT Fri Aug 21 2026
Key Messages
- Another system to pass through the area, bringing the chance for afternoon showers/storms along a passing cold front. A few storms may be strong to severe.
- A stretch of quiet and mostly dry weather will be seen this weekend and into next week, with seasonal temperatures.
Aviation
/12Z TAFS THROUGH 12Z SATURDAY/... Issued at 619 AM CDT Fri Aug 21 2026
Mainly VFR weather will continue through today, though a cold front arriving this afternoon will bring a chance (20-50%) for storms to ext...