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Mermet Lake State Conservation Area, IL Weather Forecast
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Mermet Lake State Conservation Area Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY |
 |  |  | | | | | | | | | |
| Chance of T-Storm | Sunny | Mostly Clear | Sunny | Clear | Sunny | Mostly Clear | Clear | Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1152 PM CDT Wed Aug 26 2026 
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Issued: 1218 AM CDT Thu Aug 27 2026
Key Messages
- Isolated showers and thunderstorms will be possible overnight before the cold front makes complete passage before sunrise. Dry conditions are expected the rest of the 7 day period.
- Confidence continues to increase that a late season heatwave will impact our region beginning Sunday and continue through most of next week. High temperatures are forecast to reach the mid to possibly upper 90s. While humidity levels will be lower than previous heatwaves this summer, heat index readings li...