April to May and September to October is the best time to visit Chicago as the weather is mild and tourist numbers are moderate. In late spring, celebrate local beer culture at the Mayfest. Summer in the city is famous for its hotel rates going through the roof and unstable weather when agonizing heat waves from June to August can hinder your sightseeing experience. However, Chicago is lucky to be located next to the lake, that's why festival goers boldly and enthusiastically attend Lollapalooza and other great summer events. September says goodbye to the summer at the Chicago Jazz Festival and during the Chicagohenge at the end of the month. A freezing and windy period between November and March offers you great deals on airfare and accommodation, just pack your warmest layers. St. Patrick's Day turns the Chicago River green in March, probably one of the best sights of the city!