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Lac Marseilles Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  | |  |  |  |  | | | |  | |
| Mostly Cloudy | Mostly Sunny | Mostly Cloudy | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Sunny | Mostly Clear | Mostly Clear |
| Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 71°FHi: 22°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Hi: 70°FHi: 21°C Lo: 59°FLo: 15°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C Lo: 51°FLo: 11°C |
| POP: 20% | POP: 70% | POP: 90% | POP: 50% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 943 PM CDT Tue Sep 29 2026 
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Issued: 1004 PM CDT Tue Sep 29 2026
Key Messages
- Widespread rain is expected along a slow-moving cold front Wednesday night through Friday. A swath of 2-3 inches of rain is most likely across northern Missouri and west-central Illinois, with decreasing values further south and east.
- There are increased chances for river flooding by next week along the Missouri River, Mississippi River, and northeast Missouri tributaries due to heavy rain in and upstream of these basins.
- Temperatures stay abnormally warm through Thursday before a re...