Glen Carbon, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Glen Carbon, a village in Madison County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. Southeast wind around 3 mph.
7-day forecast for Glen Carbon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 3 mph SE | 0% |
| Tonight | 67°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 90°F | Sunny | 2 to 7 mph S | 11% |
| Wednesday Night | 71°F | Slight Chance Showers And Thunderstorms | 7 mph S | 70% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 6 mph S | 72% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 5 mph SE | 39% |
| Friday | 86°F | Chance Showers And Thunderstorms | 5 mph SW | 39% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph S | 34% |
| Saturday | 89°F | Chance Showers And Thunderstorms then Mostly Sunny | 2 to 6 mph S | 34% |
| Saturday Night | 72°F | Mostly Clear | 7 mph S | 8% |
| Sunday | 91°F | Sunny | 6 to 9 mph S | 7% |
| Sunday Night | 74°F | Mostly Clear | 8 mph S | 5% |
| Monday | 93°F | Sunny | 6 to 9 mph S | 5% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 9 mph S | 16% |
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
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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 Aug 4, 2026.