Weather World
City of Winchester, ILWinchester, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Winchester Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  | | | | |  |  | |  |
| Thunderstorms | Chance of T-Storm | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy |
| Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C |
| POP: 80% | POP: 80% | POP: 50% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 437 PM CDT Tue Sep 15 2026 
Winchester Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Winchester Weather Map
Winchester Quick Facts
Winchester Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 206 PM CDT Tue Sep 15 2026
Key Messages
- A level 1 risk of severe weather continues through this evening, with potential for localized damaging winds.
- The storms tonight will produce areas of heavy rain, with potential for localized flooding north of I-72 where training storms are more likely.
- The unseasonably hot weather will continue in areas south of I-72 into the weekend.
Discussion
... Issued at 206 PM CDT Tue Sep 15 2026
Primary boundary stretches from just north of Quincy to near La Salle this hour, while satellite cont...