By Tammie Souza

CHICAGO (CBS) — Sunday was summer’s final gift to us.

It was a kiss of spectacular weather before the smackdown of rain and chilly start to fall.

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The low for Sunday night is 70.

Lows Tonight: 09.19.21

(Credit: CBS 2)

A disturbance lifts north across the area late Sunday night and Monday morning, resulting in widely scattered showers and thunderstorms. Monday’s temperatures will drop to near seasonal values, but humidity will be on the rise.

Next 24 Hours: 09.19.21

(Credit: CBS 2)

Late Monday night and Tuesday morning, a cold front will sweep past the area triggering gusty storms and a few downpours.

Planner Tomorrow: 09.19.21

(Credit: CBS 2)

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There is a Marginal Risk severe weather for far western DeKalb and LaSalle counties on Monday night. This is level one of five – the lowest – and the threat is damaging winds from a line of storms but can’t rule out a brief QLCS tornado embedded in the line.

Severe Weather Outlook: 09.19.21

(Credit: CBS 2)

This Marginal Risk it could be shifted farther east by Monday. It’s worth watching.

The high for Monday is 80.

Highs Tomorrow: 09.19.21

(Credit: CBS 2)

Much cooler fall-like air pours in behind this front for the start of fall on Wednesday.

7 Day Forecast: 09.19.21

(Credit: CBS 2)

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The high for Tuesday is 73, Wednesday just 68, and Thursday 67.