Michigan last experienced a heat wave of similar length in 1995, Suttle said, although it is usual to experience smaller stints of intense heat this time of year.

At press time, today’s temperatures were forecasted to approach the record high of 91, set in 2006.

On Sunday afternoon, temperatures hovered around 90 with a heat index of 95.

Last year, heat indexes in Michigan only rose past 100 briefly, never lasting for more than a few hours, Suttle said.

The MSU Dairy Store saw a large spike in business with the arrival of the heat wave, said Head Supervisor John Holderbaum, with a line winding out the door at 2 p.m. Sunday.

“We get a ton of business when it’s hot like this,” Holderbaum said.

The East Lansing Family Aquatic Center, 6400 Abbot Road, had a line winding from its admissions gate to the street when it opened at 11 a.m. Sunday, manager Dee Careathers said.

“We see a ton more people come out (during high temperatures),” she said.

The center has extra staff members working this week to cope with the influx of visitors.

Average temperatures for East Lansing in mid-July usually range in the low 80s, according to weather.com.

Areas of Wisconsin and several plain states already are experiencing blistering temperatures with heat indexes over 100 throughout the central U.S.

Suttle said high humidity could make the heat index higher than other periods of extreme temperature. On Sunday, humidity hung at around 43 percent.

Graduate student Chelsea Grinds said she often goes to the pool at her friend’s apartment complex during extreme temperatures, although she does not mind the heat overall.

“I’ll usually just (lie) out,” Grinds said.

But no-preference sophomore Kelsee Nousain would rather hide indoors in her Cedar Village apartment, right next to the air conditioner.

“I sit right next to it, and I don’t move,” Nousain said. For her, the heat is not something to relish. “I hate it; I hope it cools down soon.”