Warmer temperatures in the forecast for Chicago after record-setting storm

How much rain did Chicago get on Sunday?

To put it into perspective, the average amount of rain in July for the city is 3.7 inches, and some parts of the Chicago area received up to 9 inches during the storm that caused widespread flash flooding and delayed the inaugural NASCAR event, according to preliminary amounts reported by the National Weather Service.

The rain started around 8 a.m. Sunday and persisted for the rest of morning and most of the afternoon with continuous periods of very heavy rain from a system that developed over the city, with most of the rain falling during a six-hour period, according to Kevin Birk, a meteorologist with the National Weather Service in Romeoville.

“There were two waves that hit. The first wave was in the 9 [a.m.] to noon time frame, and then the second one came during the 1-3, 1-4 [p.m.] time frame,” Birk said.

At the city’s official recording station at O’Hare Airport, 3.35 inches of rain was reported, breaking the previous daily record of 2.06 inches in 1982. ​It was the highest daily rainfall total at the airport since May 2020, when 3.53 inches was recorded. Midway Airport saw 4.68 inches of rain.

The storm hit other parts of the metro area especially hard, including in west suburban Berwyn, which saw nearly 9 inches of rain. Garfield Park on the West Side of Chicago got 8.12 inches, Lincoln Park 7.89 inches, Evanston 7.09 inches and Oak Park 6.04 inches.

The last time Chicago saw nearly 9 inches of rain was Aug. 13-14, 1987, when 9.35 inches of rain was recorded in a 24-hour period at O’Hare, with 8.35 inches occurring in the span of 12 hours, Birk said. In 2011, 8.41 inches of rain was recorded July 22-23 at O’Hare.

Birk said the rest of Monday was expected to be “fairly quiet,” with highs near the lake in the 70s and inland temperatures in the mid- to upper 80s. For the July 4 holiday, highs are expected to be around 90 with a chance of an isolated thunderstorm. That storm isn’t expected to be widespread, Birk said, with maybe a couple of isolated storms possible in the afternoon.

“But it shouldn’t shouldn’t affect fireworks,” Birk said.

The weather service is watching another system for Wednesday, which is expected to be another warm day with a cold front coming in the afternoon and evening that “could actually spark off some strong, maybe even severe thunderstorms as we head into Wednesday evening,” Birk said.