Weather World
City of Mt. Vernon, IllinoisMount Vernon, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Mount Vernon Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | VETERANS DAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | |  |  |  |  | | | | |
| Patchy Fog | Clear | Sunny | Mostly Clear | Showers | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Clear |
| Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 69°FHi: 21°C | Lo: 41°FLo: 5°C | Hi: 51°FHi: 11°C Lo: 31°FLo: -1°C | Hi: 51°FHi: 11°C Lo: 31°FLo: -1°C | Hi: 45°FHi: 7°C | Hi: 51°FHi: 11°C Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C Lo: 29°FLo: -2°C | Lo: 31°FLo: -1°C |
| POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 347 AM CST Mon Nov 09 2026 
Mount Vernon Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Mount Vernon Weather Map
Mount Vernon Quick Facts
Mount Vernon Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 509 AM CST Mon Nov 9 2026
Key Messages
- Temperatures will be 5 to 10 degrees above normal today through Wednesday, with highs ranging from the upper 60s to lower 70s.
- The risk of rain showers and isolated thunderstorms Wednesday afternoon into Wednesday evening remains steady at a 40-60% ahead of a strong cold front. Temperatures Thursday are projected to be 20 to 25 degrees cooler than Wednesday with conditions staying cool until late Saturday or Sunday.
Discussion
... Issued at 1236 PM CST Sun Nov 8 2026
The main item of co...