Despite it being July, jackets may be in order next week as an essence of the dreaded "Polar Vortex" is expected to come through the Chicago area.
"We're looking at much lower temperatures across Chicago and much of the central United States," National Weather Service spokesman Andy Foster said.
Early next week, temperatures could get into the low 70s and high 60s during the day, and dip down into the upper 40s by nightfall, Foster said.
The oddly low temperatures are expected to begin Monday, and then bottom out Tuesday and Wednesday.
Most Midwesterners are accustomed to mid-80s this time of year, he added, making this an unusual – however, not unprecedented – phenomenon.
The record low for July 15, which falls on Tuesday this year, is 52 degrees in 1926, Foster said.
"So it may be close. We may approach record-low temperature territory Tuesday night," he said. "The cooler temperatures will be out in the suburbs more than in the city."
The culprit – a cool air mass traveling south from Canada – is expected to pass through the area by the end of next weekend.
Until then, Foster suggested people just enjoy the "lucky cool break" from the typical stifling summer weather.