The best time to visit Kewanee, Illinois, is during the late spring, summer, and early autumn months, specifically from May to October, when the weather is most pleasant for outdoor activities.During these months, the temperatures are generally mild to warm, making it comfortable to explore the city's parks, historical sites, and attend local events. The summer months, June through August, offer the warmest weather, ideal for enjoying outdoor attractions like Windmont Park and its scenic lake.For those interested in local culture and community events, September is a particularly good time to visit, as it typically hosts the popular Hog Days festival.