Granite City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Granite City, a city in Madison County, Illinois.
Overnight
74°F
Partly Cloudy
Partly cloudy, with a low around 74. South wind around 5 mph.
7-day forecast for Granite City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 74°F | Partly Cloudy | 5 mph S | 9% |
| Saturday | 99°F | Mostly Sunny | 3 to 8 mph SW | 6% |
| Saturday Night | 75°F | Partly Cloudy | 5 mph S | 2% |
| Sunday | 95°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 21% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph N | 61% |
| Monday | 81°F | Rain Showers Likely | 6 to 12 mph N | 70% |
| Monday Night | 61°F | Showers And Thunderstorms Likely | 7 to 12 mph N | 70% |
| Tuesday | 73°F | Chance Rain Showers then Mostly Cloudy | 12 mph N | 27% |
| Tuesday Night | 55°F | Mostly Cloudy | 6 to 12 mph N | 6% |
| Wednesday | 76°F | Mostly Sunny | 9 mph N | 2% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 8 mph N | 2% |
| Thursday | 77°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Thursday Night | 59°F | Partly Cloudy | 3 to 8 mph NE | 3% |
| Friday | 78°F | Mostly Sunny | 5 to 8 mph N | 6% |
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
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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 Sep 19, 2026.