Weather World
Chamnesstown, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Chamnesstown Weather Forecast
| OVERNIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY |
 |  | |  | | | | | | | |
| Clear | Chance of Showers | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 95°FHi: 35°C Lo: 69°FLo: 21°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Fri Sep 04 2026 
Chamnesstown Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Chamnesstown Weather Map
Chamnesstown Quick Facts
Chamnesstown Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 617 AM CDT Fri Sep 4 2026
Key Messages
- An Extreme Heat Warning remains in effect through Saturday for a prolonged dangerous heatwave with daily heat index values ranging from 103-110 degrees. There is a 30-90% chance of triple digit heat index values continuing into Sunday over southeast Missouri, the Purchase Area of Kentucky, and adjacent portions of southern Illinois.
- Near record high temperatures in the upper 90s to around 100 degrees and near record warm overnight low temperatures in the mid to upper 70s are expected...