Weather WorldFlag Center, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Flag Center Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  | | |  |  | | |  |  |  | |
| Mostly Clear | Chance of Showers | Mostly Clear | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C |
| POP: 40% | POP: 20% | POP: 60% | POP: 70% | POP: 70% | POP: 80% | POP: 70% | POP: 50% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 925 PM CDT Sat Sep 12 2026 
Flag Center Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Flag Center Weather Map
Flag Center Quick Facts
Flag Center Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 629 PM CDT Sat Sep 12 2026
Key Messages
- Turning cooler tomorrow with a chance for afternoon showers.
- Waves of heavy rain producing thunderstorms possible in the general region early to mid next week.
Discussion
... Issued at 130 PM CDT Sat Sep 12 2026
A cold front is pushing into northwest Illinois early this afternoon and will continue to shift across the forecast area through this evening. While dewpoints have been slowly climbing into the upper 60s/near 70 degrees ahead of this boundary, forecast soundings remain generally...