Chicago is headed into a third straight day with heat-index readings near 100 degrees, and Thursday could be the most uncomfortable stretch yet. Early Thursday was already warm and muggy, with temperatures around 81 degrees, while the afternoon forecast calls for a high near 93 and heat indexes as high as 100 to 105. An Extreme Heat Warning remains in effect through 7 p.m. for Chicago and surrounding Cook County areas.
Heat Peaks Before The Front Arrives
Mostly sunny skies will dominate the morning as temperatures climb through the 80s and into the low 90s. Showers and thunderstorms become possible after 1 p.m., with a 40% chance of rain in the Chicago forecast and the potential for a quick temperature drop later in the day.
Southwest winds of 5 to 10 mph could shift as cooler air pushes in from the lake and the north. Storms may bring locally strong wind gusts, especially across northern and northeastern parts of the region, so outdoor plans could change quickly Thursday afternoon and evening.
Storm Chances Continue Into Friday And Saturday
Thursday night brings a 40% chance of showers and thunderstorms, along with a low near 71 degrees. Friday should be cooler, with a high around 85 and storms possible before 1 p.m., but another round of showers and thunderstorms could develop Friday night.
Saturday stays unsettled with a 50% chance of storms before 1 p.m. and a high near 78. The heavier overnight rain threat appears more focused north of Chicago, but residents should still watch for changing conditions and localized downpours.
Sunday Brings A Welcome Weather Reset
The weekend finally turns more comfortable Sunday, when mostly sunny skies, lower humidity and a high near 76 are expected. Labor Day should remain mostly sunny with a high around 81, although warmer weather returns Tuesday and Wednesday with highs in the mid-80s and a small chance of storms.
Heat Warning Calls For Extra Caution
The National Weather Service advises residents to reconsider extended outdoor activity, wear lightweight clothing, drink plenty of fluids and check on older neighbors or anyone with health conditions. Chicago residents can call 311 for information about cooling centers or to request a well-being check.
Cook County officials say cooling centers are available during periods of excessive heat, though residents should contact a location first to confirm hours and availability. Children and pets should never be left in a parked vehicle, even for a short errand.
