Insects and mosquitoes are swarming Chicagoland. Here's why

Swarms of mosquitoes, flies and other insects have been more pervasive across Chicagoland as summer winds down, driven by hot and wet conditions. National Weather Service data cited in the article says 2026 was the 17th-wettest summer since 1871. Residents near Lake Michigan—including a couple who watch the same spot at Montrose Beach—said they’ve never seen this many bugs, with insects landing on skin and causing a faint stinging sensation. University of Illinois entomologist Chris Dietrich said heavy rains can create ideal breeding sites where standing water accumulates, and warmer temperatures speed mosquito life cycles. The article also notes heightened cicada activity and the risk to backyards and lakefront gatherings as Labor Day approaches.