Charleston, IL Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. South southeast wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 1 to 5 mph SSE | 0% |
| Tonight | 64°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 86°F | Sunny | 5 mph S | 0% |
| Wednesday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 37% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 3 to 7 mph SSW | 70% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 36% |
| Friday | 84°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 23% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 21% |
| Saturday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph SSW | 16% |
| Sunday | 87°F | Sunny | 6 to 9 mph SSW | 9% |
| Sunday Night | 71°F | Mostly Clear | 8 mph SSW | 9% |
| Monday | 88°F | Mostly Sunny | 9 mph SW | 14% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 8 mph SSW | 25% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Charleston, IL
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
187 days
Hardiness zone
6a
Explore more for Charleston, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Charleston, Il (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.