Illinois Valley Regional Airport-Walter A Duncan Field UV IndexUnited StatesILLa Salle CountyIllinois Valley Regional Airport-Walter A Duncan Field1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAIllinois Valley Regional Airport-Walter A Duncan Field UV forecast issued yesterday at 2:18 pm. Next forecast at approx. 2:18 pm.Get WillyWeather+ to remove ads