Chester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chester, a city in Randolph County, Illinois.
This Afternoon
99°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 99. Heat index values as high as 108. South wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for Chester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Chance Showers And Thunderstorms | 2 mph S | 26% |
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph SE | 22% |
| Saturday | 98°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 | 3 to 9 mph N | 53% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 6 to 9 mph N | 53% |
| 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 | 76°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 7 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 2 to 8 mph N | 2% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 7 mph N | 3% |
Forecast source: National Weather Service (api.weather.gov) for Chester (37.926, -89.828). Updated through the day.
Growing snapshot for Chester
Last spring frost
Apr 8
First fall frost
Oct 30
Growing season
202 days
Hardiness zone
7a
More local growing data for Chester: nearby ZIP 62233 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Kaskaskia Rvr Navigation Lock, Il (9.1 mi from Chester). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.