Weather in Grand Detour, Illinois
Live weather conditions. Source: Open-Meteo
Updated May 24, 2026 · 06:14 PM ET · Refreshes every hour
80°F
Clear sky
Feels like 77°F
31%
Humidity
6 mph
Wind Speed
About Weather in Grand Detour
Grand Detour is located in Illinois (coordinates: 41.901154°N, 89.41309°W). Weather data is sourced from Open-Meteo, a free and open meteorological API using data from national weather services including NOAA.
All temperatures are displayed in Fahrenheit. Wind speed is in miles per hour.