Chester, IL Weather & Growing Conditions
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. Southeast wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 1 to 5 mph SE | 13% |
| Saturday | 97°F | Mostly Sunny | 6 mph SW | 5% |
| Saturday Night | 71°F | Partly Cloudy | 5 mph S | 0% |
| Sunday | 95°F | Mostly Sunny | 2 to 6 mph W | 6% |
| Sunday Night | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph N | 37% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 52% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 6 to 9 mph N | 52% |
| Tuesday | 75°F | Slight Chance Rain Showers then Partly Sunny | 8 to 12 mph N | 15% |
| Tuesday Night | 55°F | Partly Cloudy | 5 to 12 mph N | 8% |
| Wednesday | 75°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Wednesday Night | 54°F | Partly Cloudy | 3 to 7 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 1% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Friday | 76°F | Mostly Sunny | 3 to 8 mph N | 5% |
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 Sep 19, 2026.