The best time to visit Charleston, Illinois, is during the spring (April to May) and fall (September to October) when the weather is most pleasant for outdoor activities.During these seasons, temperatures are mild, typically ranging from the 60s to high 70s Fahrenheit, making it comfortable for exploring the city's parks, campus, and downtown area. Spring brings blooming flowers and a refreshing atmosphere, while fall offers colorful foliage and a crisp air that's ideal for walking tours or enjoying local events.For those planning to visit Eastern Illinois University, these periods coincide with active campus life, including various academic and cultural events that can add to your experience.