Chicago heat wave begins Sunday with index values ​​near 100 degrees – NBC Chicago

Seasonal temperatures and low humidity created nice conditions to end the work week before a period of lingering heat and heat indexes as high as 105 degrees.

Temperatures rose into the 70s and 80s across much of the region Friday evening after values ​​plunged in many places due to winds blowing off the lake, according to NBC 5 Storm Team Meteorologist Kevin Jeanes. For example, readings in Elmhurst dropped from 85 to 77 degrees in a matter of hours.

As darkness prevails, temperatures will drop into the low 60s overnight – before pleasant conditions arrive. The region as a whole will see temperatures around 85 degrees, while values ​​will be noticeably lower along the lakeshore.

Warmer conditions will arrive on Father's Day, although heat index values ​​will largely match air temperatures. High temperatures are expected to reach between 90 and 94 degrees, Jeanes said.

Breezy will be noticeable, with wind gusts between 15 and 25 miles per hour.

Showers cannot be entirely ruled out early in the morning, especially in portions of north-central Illinois near Interstate 39. However, it is possible that rain will be limited to the western portion of the Illinois.

The heat wave will intensify on Monday, with heat indices reaching 105 degrees on that date and Tuesday.

The predicted heat is consistent with guidelines recently released by the National Weather Service's Weather Prediction Center, pointing to the “first long-lasting heat wave of the summer.”

If the stretch of warm weather materializes, Chicago's best chance of setting daily temperature records could be between June 22 and 23, with both records currently at 97 degrees.

Another record that could fall is the highest minimum temperature recorded on June 21 in recorded history. This record stands at 74 degrees, the mark having been set 101 years ago.