Weather in Granite City, IL
Updated 2026-09-26 10:00 local time · ZIP codes 62040
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
66°10% rain69°10% rain71°9% rain70°10% rain72°9% rain73°9% rain72°9% rain
70°17% rain68°17% rain
66°15% rain
66°12% rain65°10% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 17%).
It feels like 61°F with winds near 5 mph.
71°F, 9% rain chance and 5 mph wind.
Visibility is around 6 mi; gusts may reach 10 mph.
Current temperature is 66°F, wind 5 mph, rain chance up to 17%.
UV index is 2.
Local weather characteristics in Granite City
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Granite City is part of the Midwest weather region. The forecast point is near 38.70°N latitude and 90.15°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Granite City weather today
Overcast and 66°F in Granite City, IL. Today's high is 73°F with a 19% rain chance. Winds are around 5 mph with gusts near 8 mph. Relative humidity is 38%, pressure is 30.15 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Granite City
Sunrise is at 06:52 AM and sunset is at 06:51 PM. Tomorrow's forecast calls for Overcast with a high near 81°F and a low near 63°F. The maximum rain chance is 6%.