The best time to go to Lisle, Illinois, is during the late spring (May to early June) and early autumn (September to October) when the weather is mild and pleasant.Late spring offers comfortable temperatures, typically ranging from 15°C to 25°C, making it ideal for outdoor activities. The Morton Arboretum, a major attraction in Lisle, is particularly beautiful during this time with blooming flowers and lush greenery. It's a great time for couples to enjoy strolls through the extensive grounds or families to explore the children's garden and various walking trails without the intense heat of summer.Early autumn also provides excellent weather, with temperatures usually between 10°C and 20°C. The changing colours of the leaves at The Morton Arboretum are a spectacular sight, offering a picturesque backdrop for photography enthusiasts or anyone looking for a relaxing day out.