Categories: Illinois News

Wednesday forecast: Temps creeping up in Chicagoland, Air Quality Alert in effect all day



Temperatures continue to creep up in Chicagoland this week, with Wednesday highs in the mid- to upper 80s.

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With winds shifting from southeast to south and then southwest, the heat and humidity will continue to climb, as we see temps back in the low 90s for the end of this week, though not quite as humid and oppressive as other heat waves this summer (see more below).

Wednesday also begins with a fair amount of sunshine for the first two-thirds of the day, but some cloud coverage filters the sunshine later in the afternoon and evening.

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 7

Meanwhile, smoke from Canadian wildfires continues to hang over the area, with an Air Quality Alert in effect for most of Chicagoland until midnight Wednesday night.

Weather systems moving in from the west should then circulate some of that smoky air out of our area.

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 8
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 9

Here’s the latest from the Illinois EPA:   

⚠️ AIR QUALITY ALERT IN EFFECT UNTIL MIDNIGHT WEDNESDAY NIGHT ⚠️

The Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Wednesday, Aug. 6, for the greater Chicago metropolitan area through midnight Wednesday night.

A Chicago area “Air Pollution Action Day” is declared when weather conditions are such that widespread ozone and/or particulate levels are expected to be at or above the Unhealthy for Sensitive Groups (USG) category of the Air Quality Index (AQI) for multiple days.

Ozone is expected to be the primary pollutant of concern, but wildfire smoke also is lingering in the region and may impact PM2.5 and Ozone AQI.

Active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. 

Wednesday: High temps/winds  

Daytime highs continue to warm over the previous day for the fifth consecutive day.

Highs will surge well into the 80s inland, but slightly cooler conditions on area beaches and along the immediate lakeshore continue as light southeast winds slice off the lake. 

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 10
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 11

Lake Michigan water temps and beach forecast

Lake Michigan water temperatures continue to be in the mid-70s, near summer’s peak.

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Light southeast winds will create a modest chop on the lake Wednesday and shouldn’t have much impact for area boaters and swimmers, with only 1- to 2-foot waves currently forecasted. 

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 12
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 13

Wednesday sunburn forecast

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 14


Current Conditions

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 15
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 16
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 17
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 18

Next Few Hours

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 19
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 20

Extended Outlook

The extended outlook calls for Chicagoland staying close to 90 for the next several days, with each day seeing at least a slight chance of showers or storms. The peak heat looks to be Saturday, at 93.

The best chances for some much-needed rainfall are few stray showers late Wednesday, then late afternoon and evening on Sunday and Monday.  

August 2025 is about to change its cooler-than-normal character, as late-season heat takes hold across the area. Highs are forecast to reach about 90 degrees from Friday through Monday, with slight cooling into the upper 80s possible on Sunday.   

Forecast highs: Friday

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 21

Forecast highs: Saturday

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 22

Forecast highs: Sunday

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 23

Forecast highs: Monday

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 24

Forecast Friday temperature departure from normal

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 25

Forecast Saturday temperature departure from normal

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 26

Forecast Sunday temperature departure from normal

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 27

Forecast Monday temperature departure from normal

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 28

Forecast average max temperature departure from normal: Aug. 8-12

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 29

Forecast Chicago highs and how much above normal

A string of above-normal days are on tap as we move forward the rest of the week and into next week.

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 30

Chicago humidity forecast

Humidity will slowly return in the coming days, but there will be no repeat of the oppressive levels observed at times last month. 

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 31

Forecast 2m temperature anomaly animation

Blue areas indicate cooler-than-normal temperatures, while the orange and red areas indicate warmer-than-normal temperatures. You can see by this animation how we’re headed toward a much warmer weather pattern in the days ahead.

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 32

Tropical update

Dexter is going out to sea and is continuing to weaken, posing no threat to land, but a couple other areas of disturbed weather are being monitored by the National Hurricane Center for potential development.    

Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 33
Wednesday forecast: temps creeping up in chicagoland, air quality alert in effect all day 34

Climate and Environment news: WGN Weather Center blog

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