Granite City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Granite City, a city in Madison County, Illinois.
This Afternoon
73°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 73, with temperatures falling to around 68 in the afternoon. South wind around 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%.
7-day forecast for Granite City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Rain | 20 mph S | 92% |
| Tonight | 54°F | Rain | 8 to 18 mph S | 96% |
| Wednesday | 65°F | Chance Rain Showers then Mostly Cloudy | 8 to 14 mph W | 11% |
| Wednesday Night | 45°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 67°F | Sunny | 5 to 10 mph W | 1% |
| Thursday Night | 45°F | Mostly Cloudy | 6 mph NW | 8% |
| Friday | 59°F | Mostly Cloudy | 6 to 10 mph NW | 6% |
| Friday Night | 40°F | Partly Cloudy | 2 to 7 mph N | 1% |
| Saturday | 57°F | Partly Sunny | 5 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 63°F | Sunny | 1 to 7 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 5% |
| Monday | 67°F | Sunny | 2 to 7 mph SW | 2% |
| Monday Night | 42°F | Mostly Clear | 3 mph SW | 1% |
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
Alhambra
Alton
Bethalto
Collinsville
East Alton
Edwardsville
Glen Carbon
Godfrey
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, Cahokia St Louis Ap, Il (10.4 mi from Granite City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.