Carterville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Carterville, a city in Williamson County, Illinois.
This Afternoon
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. Southeast wind around 7 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
7-day forecast for Carterville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Chance Showers And Thunderstorms | 7 mph SE | 39% |
| Tonight | 56°F | Showers And Thunderstorms | 7 to 14 mph S | 99% |
| Wednesday | 68°F | Partly Sunny | 5 to 9 mph SW | 8% |
| Wednesday Night | 43°F | Partly Cloudy | 2 mph SW | 0% |
| Thursday | 69°F | Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 2 mph WNW | 5% |
| Friday | 61°F | Partly Sunny | 3 to 9 mph NNW | 3% |
| Friday Night | 39°F | Mostly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 58°F | Partly Sunny | 5 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Mostly Sunny | 0 to 6 mph W | 5% |
| Sunday Night | 35°F | Mostly Clear | 2 mph WNW | 5% |
| Monday | 66°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 38°F | Mostly Clear | 3 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Carterville (37.763, -89.084). Updated through the day.
Growing snapshot for Carterville
Last spring frost
Apr 9
First fall frost
Oct 22
Growing season
195 days
Hardiness zone
7a
More local growing data for Carterville: nearby ZIP 62918 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Blairsville
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Cambria
Colp
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Energy
Freeman Spur
Herrin
Hurst
Johnston City
Marion
Pittsburg
Spillertown
Whiteash
Climate data from the nearest NOAA station, Carbondale Sewage Plt, Il (5.8 mi from Carterville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.