Granite City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Granite City, a city in Madison County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. South wind around 6 mph.
7-day forecast for Granite City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 6 mph S | 0% |
| Tonight | 69°F | Mostly Clear | 2 to 6 mph SE | 0% |
| Wednesday | 91°F | Sunny | 2 to 7 mph S | 11% |
| Wednesday Night | 72°F | Slight Chance Showers And Thunderstorms | 7 mph S | 69% |
| Thursday | 88°F | Showers And Thunderstorms Likely | 6 mph S | 71% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 5 mph SE | 36% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 3 mph S | 33% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph S | 33% |
| Saturday Night | 73°F | Mostly Clear | 6 mph S | 7% |
| Sunday | 93°F | Sunny | 5 to 9 mph S | 7% |
| Sunday Night | 75°F | Mostly Clear | 8 mph S | 5% |
| Monday | 94°F | Mostly Sunny | 6 to 9 mph SW | 5% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms | 8 mph S | 16% |
Forecast source: National Weather Service (api.weather.gov) for Granite City (38.729, -90.125). Updated through the day.
Growing snapshot for Granite City
Last spring frost
Apr 8
First fall frost
Oct 26
Growing season
200 days
Hardiness zone
7a
More local growing data for Granite City: nearby ZIP 62040 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Cahokia St Louis Ap, Il (10.4 mi from Granite City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.