Glen Carbon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Glen Carbon, a village in Madison County, Illinois.
This Afternoon
72°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 72, with temperatures falling to around 67 in the afternoon. South wind around 21 mph, with gusts as high as 32 mph. Chance of precipitation is 90%.
7-day forecast for Glen Carbon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Rain | 21 mph S | 92% |
| Tonight | 55°F | Rain | 9 to 17 mph S | 97% |
| Wednesday | 63°F | Chance Rain Showers then Mostly Cloudy | 8 to 14 mph SW | 12% |
| Wednesday Night | 45°F | Partly Cloudy | 7 mph SW | 0% |
| Thursday | 66°F | Sunny | 6 to 10 mph W | 1% |
| Thursday Night | 46°F | Mostly Cloudy | 6 mph NW | 7% |
| Friday | 58°F | Partly Sunny | 6 to 10 mph NW | 6% |
| Friday Night | 40°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 56°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 62°F | Sunny | 2 to 7 mph W | 7% |
| Sunday Night | 38°F | Mostly Clear | 5 mph W | 5% |
| Monday | 66°F | Sunny | 2 to 8 mph SW | 2% |
| Monday Night | 42°F | Mostly Clear | 5 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Glen Carbon (38.758, -89.983). Updated through the day.
Growing snapshot for Glen Carbon
Last spring frost
Apr 4
First fall frost
Nov 5
Growing season
214 days
Hardiness zone
7a
More local growing data for Glen Carbon: nearby ZIP 62034 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Alhambra
Alton
Bethalto
Collinsville
East Alton
Edwardsville
Godfrey
Granite City
Grantfork
Hamel
Hartford
Highland
Holiday Shores
Livingston
Madison
Marine
Maryville
Mitchell
Moro
New Douglas
Pontoon Beach
Prairietown
Rosewood Heights
Roxana
South Roxana
St. Jacob
Troy
Venice
Williamson
Wood River
Climate data from the nearest NOAA station, Alton - Melvin Price L&D, Il (12.3 mi from Glen Carbon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.