Weather World
Jack Lake, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Jack Lake Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  | | |  | |  |  | | |
| Patchy Fog | Partly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of Showers | Mostly Sunny | Mostly Clear | Chance of Showers | Showers Likely | Showers |
| Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C |
| POP: 30% | POP: 40% | POP: 60% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 222 AM CDT Fri Sep 11 2026 
Jack Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Jack Lake Weather Map
Jack Lake Quick Facts
Jack Lake Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 209 AM CDT Fri Sep 11 2026
Key Messages
- Dense fog will reduce visibility to a quarter mile or less across portions of central Illinois through mid-morning. Drive with caution and allow extra stopping distance.
- Isolated showers and possibly a brief funnel cloud or two are possible this afternoon and evening south of I-72, but the overall severe storm threat is very low.
- Summerlike heat returns this weekend with highs approaching 90 degrees in parts of central Illinois, followed by periodic chances for thunderstorms next wee...