Weather WorldLower Flat Lake, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Lower Flat Lake Weather Forecast
| REST OF TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  | |  |  |  |  | | | |
| Chance of Showers | Partly Cloudy | Sunny | Mostly Clear | Mostly Sunny | Mostly Cloudy | Chance of T-Storm | Chance of T-Storm | Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C Lo: 59°FLo: 15°C |
| POP: 30% | POP: 50% | POP: 50% | POP: 70% | POP: 70% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 938 AM CDT Sun Sep 27 2026 
Lower Flat Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Lower Flat Lake Weather Map
Lower Flat Lake Quick Facts
Lower Flat Lake Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 603 AM CDT Sun Sep 27 2026
Key Messages
- Widespread rain is forecast beginning late Tuesday and last through late this week. Northeast Missouri and west-central Illinois have the best chance at receiving higher end amounts.
- A gradual warm-up will last through the early week with most seeing highs in the 80s on Tuesday.
Aviation
/06Z TAFS THROUGH 12Z MONDAY/... Issued at 558 AM CDT Sun Sep 27 2026
Intermittent light showers will affect the terminals through 14-15Z, with UIN the most likely (60% chance) to be affected. This is t...