Charleston, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Charleston, a city in Coles County, Illinois.
Overnight
69°F
Mostly Cloudy
Mostly cloudy, with a low around 69. South southeast wind around 7 mph.
7-day forecast for Charleston
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Mostly Cloudy | 7 mph SSE | 9% |
| Saturday | 91°F | Chance Showers And Thunderstorms | 7 mph SW | 33% |
| Saturday Night | 70°F | Mostly Cloudy | 5 mph S | 8% |
| Sunday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 9 mph NNW | 37% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 12 mph NE | 61% |
| Monday | 72°F | Showers And Thunderstorms Likely | 13 mph NE | 69% |
| Monday Night | 55°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 9 to 14 mph NE | 50% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 13 mph NE | 29% |
| Tuesday Night | 53°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 13 mph NNE | 29% |
| Wednesday | 71°F | Mostly Sunny | 10 mph NNE | 6% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 9 mph N | 4% |
| Thursday | 72°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Thursday Night | 54°F | Partly Cloudy | 3 to 8 mph NNE | 3% |
| Friday | 74°F | Mostly Sunny | 6 to 9 mph NNE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Charleston (39.484, -88.178). Updated through the day.
Growing snapshot for Charleston
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
187 days
Hardiness zone
6a
More local growing data for Charleston: nearby ZIP 61920 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Charleston, Il (2.5 mi from Charleston). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.