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City of Monmouth, ILMonmouth, IL Weather Forecast
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Monmouth Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY |
 |  |  | | | |  |  |  |  | | |
| Mostly Sunny | Chance of Showers | Showers | Chance of Showers | Showers | Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Clear | Mostly Clear |
| Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 51°FLo: 11°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C |
| POP: 40% | POP: 70% | POP: 50% | POP: 90% | POP: 90% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 521 AM CDT Tue Sep 29 2026 
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Instant definitions for any meteorological term.
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Issued: 613 AM CDT Tue Sep 29 2026
Key Messages
- Active stretch of weather through midweek, as an approaching system brings rounds of rainfall. Heavy rainfall is expected, with the potential for areal flooding and rises along area rivers.
- Drier weather returns late this week and through the weekend, with cool and pleasant weather.
Aviation
/12Z TAFS THROUGH 12Z WEDNESDAY/... Issued at 610 AM CDT Tue Sep 29 2026
Today will be quiet and VFR, with southeast winds under 10 kts this morning, and around 10 kts this afternoon, turning due so...