The Pocatello area experienced its high temperature for the summer thus far at 2 p.m. on Monday, in the midst of a heat advisory issued by the National Weather Service.

The temperature spiked at 99 degrees, before cloud cover moved in shortly thereafter, causing it to drop by about 7 degrees, said meteorologist Mike Huston. The heat advisory was scheduled to end at 8 p.m.

The weather service warned about Monday’s hot temperatures: “Heat-related illnesses such as heat exhaustion and heat stroke will be possible for people working or recreating outdoors, those who do not have air conditioning, and other heat-sensitive groups.”

The weather service continued, “Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water.”

Huston said the Pocatello area’s humidity was normal, at about 16 percent.

The temperature record for July 22 was 104 degrees, set in 2000.

Huston said cloud cover should remain in the area Tuesday and Wednesday, with high temperatures reaching about 94 degrees.

Heat advisories were also in effect for Monday and continuing into Tuesday in northern Utah, calling for daytime high temps of up to 105 degrees and in much of Nevada for Monday calling for daytime high temps of up to 106 degrees.

Americans from throughout the country also having to beat extreme heat. From Texas to Maine, they sweated out a steamy spell Saturday as a heat wave canceled events from festivals to horse races, chased baseball fans out of their seats and pushed New York City to order steps to avoid straining the electrical system.

The National Weather Service said on Saturday “a dangerous heat wave” sent temperatures into the 90s, with high humidity that made it feel considerably hotter. It was expected to stay warm at night, in the upper 70s to low 80s, with more heat on the way Sunday for the East Coast.

Many people in areas facing excessive heat this weekend have no air conditioning, and cities opened shelters for people to cool off. With record- or near-record-high temperatures at night when many air conditioned places are closed, the weather can become especially dangerous for people who don’t get a chance to cool down, experts say. The risks are greater for young children, the elderly and the sick.

While the Midwest will get some relief Sunday as a cold front brings storms and lower temperatures, the East won’t be so lucky until Monday, the weather service warned. The heat will be the worst from the Carolinas to Maine.

New York City authorities canceled a Times Square commemoration of the 1969 moon landing and an outdoor festival featuring soccer star Megan Rapinoe, musician John Legend and “Daily Show” host Trevor Noah.

In Philadelphia, several hundred people were evacuated from a retirement community due to a partial power outage, though it wasn’t immediately clear whether the problem was heat related. Residents were taken to a nearby shelter, and police said some went to a hospital for evaluation.

In Chicago, heat nixed several outdoor events, including a 5k run in Grant Park and a morning workout at Millennium Park.

In New Jersey, operators of the Monmouth Park horse racing track canceled six races and pushed back others, including the $1 million Haskell Invitational, until early evening. Maximum Security, the horse that crossed the finish line first in this year’s Kentucky Derby and then was disqualified, headlines the Haskell field.

Races were set to resume just before sunset.

Animal rights activists protested outside the New Jersey Shore track, where temperatures hit the high 90s.

The track set up misting fans in the paddock and saddling areas for the 14-race card, shortened post parades before the race to limit track time for the horses and hosed them down after they ran.

Amid pressure over a series of horse deaths in California, several tracks canceled their Saturday races, including Saratoga Race Course and Finger Lakes in New York and Laurel Park in Maryland.