Weather WorldCharleston, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Charleston Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
 |  | | | | | | | |  | |
| Sunny | Mostly Clear | Sunny | Clear | Sunny | Clear | Clear | Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 71°FHi: 22°C | Lo: 41°FLo: 5°C | Hi: 71°FHi: 22°C | Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C | Lo: 45°FLo: 7°C | Hi: 79°FHi: 26°C Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C Lo: 50°FLo: 10°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 437 AM CDT Mon Oct 19 2026 
Charleston Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Charleston Weather Map
Charleston Quick Facts
Charleston Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 341 AM CDT Mon Oct 19 2026
Key Messages
- Temperatures will cool into the mid 30s to lower 40s early this morning, coolest near the Indiana border where frost is more likely. Continue to take precautions to protect sensitive vegetation with these colder temperatures and threat of frost over eastern IL early this morning.
- Dry and mild weather is expected this week along with a fair amount of sunshine and fairly light winds. Highs today and Tuesday in the lower 70s, will climb into the mid to upper 70s Thursday through Sunday....