Chester, IL Weather & Growing Conditions
Today
86°F
Patchy Fog then Sunny
Patchy fog before 7am. Sunny, with a high near 86. East wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 89°F | Sunny | 0 to 3 mph S | 2% |
| Wednesday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 30% |
| Thursday | 88°F | Chance Showers And Thunderstorms | 5 mph S | 48% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 3 mph S | 59% |
| Friday | 87°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 mph SW | 59% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph SW | 42% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 42% |
| Saturday Night | 70°F | Partly Cloudy | 5 mph S | 13% |
| Sunday | 91°F | Sunny | 7 mph S | 8% |
| Sunday Night | 72°F | Mostly Clear | 7 mph S | 4% |
| Monday | 93°F | Sunny | 7 mph S | 4% |
| Monday Night | 73°F | Mostly Clear | 8 mph S | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chester, IL
Last spring frost
Apr 8
First fall frost
Oct 30
Growing season
202 days
Hardiness zone
7a
Explore more for Chester, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Kaskaskia Rvr Navigation Lock, Il (9.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.