High pressure will remain parked over the region for early this week. And it marked the latest in the year that Chicago - according to weather service records - has ever seen five straight 90-degree days.
The heat continues to build in the Southeast leading up to next weekend.
But there will be a "noticeable cooldown" Tuesday night, Castro said, and temperatures will fall to the low 70s during the day Wednesday.
While Sunday's high temperature in Coldwater as recorded at the Branch County Memorial Airport was 89 degrees at about 3:00 p.m., it was not a record high as it missed the record by two degrees. Set in 1934, that record is just 88 degrees.
A few storms could pop up north and west of the Quad Cities Monday evening but the best chance for a rain comes during the evening commute on Tuesday. The previous latest streak of five days in a row of temperatures of 92 degrees or higher was September 15-19, 1955. These showers, if any even develop, will be very limited and light. The high temperature will be around 63 degrees Thursday.
The cold front will move through Central New York with little fanfare, but the effects will be significant and immediate.
Katherine's hottest September day will be under threat again this week. Highs on Friday will only reach the low 60s after morning lows start in the 40s.