Temperatures will be in the mid 40s and low 50s — nearly 25 degrees below normal late-May temperatures, the forecast office said. After Friday, temperatures will warm up, reaching the low 70s by the holiday. The coldest Memorial Day on record had a high temperature of 42 degrees on May 30, 1889.
High waves to close Chicago beaches to swimming on day of reopen as weather slows trains, closes part of Lakefront Trail
