Weather World
Grantfork, IL 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Grantfork, IL Weather Forecast
Grantfork, IL Weather Forecast Date: 617 AM CDT Wed Sep 02 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
Today... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph.
Tonight... Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 104 early in the evening.
Thursday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph.
Thursday Night... Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 104 early in the evening.
Friday... Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph.
Friday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 70s. Heat index values up to 105 early in the evening.
Saturday... Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the upper 90s. Chance of rain 20%. Heat index values up to 105.
Saturday Night... Partly cloudy in the evening, then clearing. A 20% chance of showers. Lows in the mid 70s. Heat index values up to 105 early in the evening.
Sunday... Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. Chance of rain 20%. Heat index values up to 100.
Sunday Night... Partly cloudy. Lows in the lower 70s. Highs in the lower 90s.
Labor Day... Partly cloudy. Lows in the lower 70s. Highs in the lower 90s.
Monday Night... A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows around 70. Chance of rain 20%.
POP = Probability of Precipitation
Grantfork Radar Loop
Use the map search tool if you want to place a location marker on the radar map...