By rssfeeds-admin 
The recent trend of high heat and humidity won’t abate in Chicagoland on Sunday, or for the start of the coming work week.
But there is a cooling trend in store as July turns to August.
As for Sunday, we’re off to a muggy start, with morning temperatures already crossing 80 and dew points in the mid- to upper 70s, making for thick, humid air.
This will send heat index values up into about the mid-90s around Chicagoland later Sunday, with high temps approaching 90. It’ll likely get even warmer on Monday, with heat index values around 100 to 105 in some locations.
There’s a chance for isolated showers or storms in the southern part of Chicagoland on Sunday night, then another chance most likely in the northwest suburbs on Monday morning, but otherwise it looks like we’ll stay mainly dry into the middle part of the week.
The heat and humidity lasts into Tuesday, then Wednesday will mark a transition to much drier, cooler air as we reach the end of July. High temps look to be back into the mid-70s on Thursday and Friday, and even cooler lakeside, under partly cloudy skies.
Beach forecast
If you’re looking to beat the heat, Sunday should be an ideal beach day.
Winds out of the southeast will remain pretty calm, and the Lake Michigan water temperature has now climbed to a comfortable 73 degrees.
Summer sizzle
It’s been a warm summer 2025 so far in Chicagoland, with 20 days of 90 degrees or warmer recorded at O’Hare International Airport and 19 days of 90 or warmer recorded at Midway International Airport, going into Sunday.
As you can see on the graphic below, those totals are already above or just below the typical average for an entire summer, and they could exceed what was a warm 2024.
There’s a chance we could crack 90 in some spots on Sunday, then it’s almost a certainty on Monday.
Current Conditions
Next Few Hours
Extended Outlook
After the summer sizzle to start the week, much cloudier and cooler conditions arrive Wednesday, with highs topping out around 80 by noon and then falling into the 70s in the afternoon, with showers and storms looking likely.
That will usher in very comfortable and cooler conditions for Thursday and Friday.
Meanwhile, after back-to-back days of drenching rain caused flooding in some Chicago neighborhoods, a break from the rain is coming on Sunday and to start the upcoming work week.
Skies will be partly cloudy and most of Sunday should stay dry, though a stray storm can’t be ruled out.
Overall, the area could use more rainfall, especially in southern Cook County and Will County, where the latest drought conditions have reached the severe level.
Summer heat across U.S.
Heat expands across the Lower 48, with 174 million U.S. residents reaching at least 90 degrees on Sunday. That number increases to 261 million by Monday, the hottest day of 2025 across the U.S. so far.
The Lower 48 forecast average temperature on Monday is predicted to be 90.5 degrees.
Chicago forecast highs and departure from normal
The heat peaks on Monday, with a noticeable cooldown expected by mid- to late next week, when a stretch of below normal temperatures is likely.
A significant pattern change sends the heat and humidity packing to the Deep South while cooler than normal temperatures dominate the Midwest, Great Lakes and Northeast.
Climate and Environment news: WGN Weather Center blog
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