The best time to go to Lyons, Illinois, is during the late spring (May to June) and early fall (September to October) when the weather is most pleasant for outdoor activities.During these months, the temperatures are moderate, typically ranging from the 60s to low 80s Fahrenheit, with less humidity than in the summer. This makes it comfortable for exploring local parks, such as the nearby Brookfield Zoo, which is a major attraction for families. The milder weather also supports walking around the low-key commercial areas of Lyons without the discomfort of extreme heat or cold.For those planning to visit attractions in downtown Chicago, which is a short drive or public transport ride away, these shoulder seasons offer the advantage of fewer crowds compared to the peak summer months.