Granite City Weather Forecast
Weather forecast for: Granite City IL
Last Update: 2:26 pm CDT Sep 6, 2026
This Afternoon: Sunny, with a high near 91. Northeast wind 5 to 9 mph.
Tonight: Partly cloudy, with a low around 65. Northeast wind 6 to 10 mph.
Labor Day: Sunny, with a high near 92. East wind 5 to 7 mph.
Monday Night: Partly cloudy, with a low around 65. East wind 5 to 7 mph becoming calm after midnight.
Tuesday: Mostly sunny and hot, with a high near 98. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night: Mostly clear, with a low around 75.
Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99.
Wednesday Night: Showers and possibly a thunderstorm. Low around 71. Chance of precipitation is 80%.
Thursday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 87.
Thursday Night: Partly cloudy, with a low around 65.
Friday: Sunny, with a high near 88.
Friday Night: A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 67.
Saturday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
WeatherWorld.com
