Lake Jaycee, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Lake Jaycee Weather Forecast
| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
| Sunny | Patchy Fog | Sunny | Patchy Fog | Patchy Fog | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Hi: 81°FHi: 27°C Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C Lo: 60°FLo: 16°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1233 PM CDT Fri Aug 21 2026 

Lake Jaycee Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Lake Jaycee Weather Map
Lake Jaycee Quick Facts
Lake Jaycee Forecast Discussion
Issued: 1227 PM CDT Fri Aug 21 2026
Key Messages
- Daily thunderstorm chances of 15 to 30% are forecast during the afternoon and evening hours Monday through Wednesday.
- Temperature and humidity levels will be near typical late August levels through the next week.
Discussion
... Issued at 1226 PM CDT Fri Aug 21 2026
Broad troughing is centered to our east and northeast putting the area in a moderate northwesterly flow aloft. A jet max works in on the backside of this trough through Sunday morning keeping it roughly in place. There is a s...
Weather World