Chicago forecast: 83 degrees and sunny Monday

A sunny day with a high near 83 degrees is expected in Chicago Monday.

“It’s definitely on the unseasonably warm side,” said Zachary Yack, a National Weather Service meteorologist.

But Monday’s high probably won’t break records. The hottest Oct. 21 in Chicago history was in 1953, when a high of 87 was recorded. On the hottest October day in Chicago ever — Oct. 6, 1963 — the mercury peaked at 94 degrees.

Typically, the temperature in Chicago maxes out in the 50s and 60s this time of year. Yack said Monday’s balmy conditions were the result of an area of high pressure.

“There’s been this big area of high pressure over the eastern U.S. over the last several weeks, and that’s been pushing a lot of warmer air up into Illinois and much of the Great Lakes,” Yack said.

Monday night is supposed to be partly cloudy and have a low around 54. A high near 73 is expected Tuesday. The National Weather Service predicts that Wednesday, Thursday and Friday will have highs over 60 degrees.