Carterville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Carterville, a city in Williamson County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. East wind 0 to 3 mph.
7-day forecast for Carterville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 0 to 3 mph E | 0% |
| Tonight | 65°F | Mostly Clear | 2 mph E | 0% |
| Wednesday | 90°F | Sunny | 2 mph SSW | 0% |
| Wednesday Night | 70°F | Partly Cloudy | 2 mph S | 4% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 2 to 7 mph SSW | 27% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 5 mph SSE | 58% |
| Friday | 89°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SSW | 58% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SSW | 38% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 5 mph SSW | 38% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSW | 17% |
| Sunday | 92°F | Sunny | 3 to 8 mph SSW | 7% |
| Sunday Night | 72°F | Mostly Clear | 3 to 8 mph SSW | 5% |
| Monday | 93°F | Sunny | 5 to 9 mph SSW | 5% |
| Monday Night | 74°F | Mostly Clear | 5 to 8 mph SSW | 5% |
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
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Johnston City
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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 Aug 4, 2026.