As summer arrives, so does the heat. When will the metro-east get some relief?

Temperatures across St. Louis and the metro-east will climb toward 100 degrees as the first official day of summer approaches Friday.

And there’s no relief in sight, according to a meteorologist with the National Weather Service in St. Louis. Above average temperatures are forecast for the remainder of the summer.

“The probability of exceedance for temperatures in June, July and August is above average,” meteorologist Lydia Jaja said.

For this week, Belleville can expect a high temperature of 91 degrees on Tuesday and climbing to 100 by Saturday. Heat indexes will top 100 all week with evening lows in the mid-70s.

Temperatures could be back into the low- to mid-90s on Sunday and early next week when the chance of rain or thunderstorms enters the forecast. Here’s a more detailed look at the predicted weather, according to the National Weather Service:

  • Monday: Mostly cloudy, with a high of 95 degrees and a low of 72 degrees at night. 30 percent change for rain.

  • Tuesday: Partly sunny, with a high of 93 degrees and a low of 75 degrees at night. 20 percent chance for rain.

  • Wednesday: Mostly sunny, with a high of 92 degrees and a low of 73 degrees at night.

  • Thursday: Mostly sunny, with a high of 95 degrees and a low of 74 degrees at night.

  • Friday: Sunny, with a high of 97 degrees and a low of 76 degrees at night.

  • Saturday: Mostly sunny, with a high of 99 degrees and a low of 77 degrees at night. 20 percent chance for rain.

  • Sunday: Mostly sunny, with a high of 94 degrees and a low of 72 degrees at night. 30 percent chance for rain in the day, and 20 percent chance for rain at night.

Jaja said the best way to be safe was to stay out of the heat as much as possible.

“Part of the risk with heat is prolonged exposure,” Jaja said. “The longer people are hot, the greater risk there is of heat-related illness.”

People without access to air conditioning should seek out local cooling centers if possible, Jaja said.

“Some people think that just because it’s not 100 degrees, it’s not bad. But emphasizing the danger of prolonged exposure is really important,” she said.

Jaja said, if you have to be outside often this summer, you should be prepared for the heat.

“Drink plenty of water, wear sunscreen and take frequent breaks out of the heat,” Jaja said. “People should also check on family, friends and neighbors — especially those without access to air conditioning — to see if they are safe.”

According to the National Oceanic and Atmospheric Administration, 2023 was the hottest year on record.

This year, a bill disallowing gas and electricity shutoff during high temperatures went into effect in Illinois. According to the bill, if temperatures are at or exceed 85 degrees, utility companies cannot shut off their services, even if the occupant hasn’t paid for them.

The bill does not necessarily include protections for unhoused people. For them, cooling centers are usually the place to go.

In Belleville, there are four cooling center locations. The centers only open when the temperature reaches 100 degrees, or if the heat index is at 105 degrees or higher. The hours for each center vary day by day, but, besides Sunday, they are open throughout most of the day.

  • Belleville Public Library, 121 E. Washington St.; open 9 a.m. to 8 p.m., Monday to Thursday; open 9 a.m. to 5 p.m., Friday and Saturday.

  • Belleville Public Library, West Branch, 3414 W. Main St.; open 9 a.m. to 5 p.m. on Monday, Wednesday, Friday, Saturday; open noon to 8 p.m. on Tuesday and Thursday.

  • Programs and Services for Older Persons, 201 N. Church St.; open 8 a.m. to 4 p.m., Monday through Friday.

  • The Salvation Army, 20 Glory Place; open 9 a.m. to 3 p.m., Monday through Friday.