Weather World
Mann Lake, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Mann Lake Weather Forecast
| THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY |
 |  | |  | |  |  | |  | | |
| Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of Showers | 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: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C Lo: 59°FLo: 15°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 PM CDT Sat Sep 19 2026 
Mann Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Mann Lake Weather Map
Mann Lake Quick Facts
Mann Lake Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 610 PM CDT Sat Sep 19 2026
Key Messages
- A Heat Advisory remains in effect this weekend, with high temperatures 15 to 20 degrees above normal in the middle 90s to near 100 degrees.
- The passage of a cold front will begin a cooling trend by Monday. Temperatures by Tuesday finally cool closer to or even a little below seasonal normals, where they hold through the end of the week.
- The cold front brings 40-70% chances of showers and storms late Sunday night through Tuesday, with the highest chances Monday into Monday night.