Steamy weather threatens fan fest, and Philly’s 1st World Cup game won’t feel like home to either team

No matter what else happens at the World Cup’s FIFA Fan Festival events Thursday and Friday on Fairmount Park’s Lemon Hill, expect hot times.

After setting four high temperature records since April, two more could fall this week in Philadelphia as a very warm June picks up steam and the mercury heads to the mid-90s on both days, while the atmosphere turns to soup.

“It’s going to be very uncomfortable,” said Bob Oravec, senior branch forecaster at the Weather Prediction Center in College Park, Md.

The National Weather Service in Mount Holly said heat indexes could reach 103 on Thursday and 105 on Friday in the city, and the Philadelphia Department of Public Health has declared a heat emergency.

With the increase in water vapor and an approaching front, thunderstorms also could pop up, and festival organizers are well aware of the potential at what will be a “rain-or-shine event,” said Philadelphia Soccer 2026 spokesperson Melissa Ferdinand.

Conditions are due to improve on the weekend, with lower humidity and just an outside chance of showers during the Sunday night match between Ecuador and Ivory Coast in South Philly.

» READ MORE: FIFA Fan Festival guide: Road closures, vendors, and more things to know before you go

When the fan festival gets underway at 2 p.m. Thursday, chances are excellent that Philly will be chasing a record, with a Friday encore. The all-time high for both Thursday and Friday in Philly is 95 degrees.

Thunderstorms are possible both afternoons, with about a 15% chance that they reach severe status — with wind gusts near 60 mph — according to the Storm Prediction Center in Norman, Okla.

Soccer matches will be televised throughout the festival, including Sunday’s game in Philly, and in the event of severe weather, the screens will carry evacuation orders, along with announcements and text communications, Ferdinand said. “Our highest priority is the safety of our guests,” she said in an email.

On Saturday, conditions should improve markedly, with daytime highs several degrees lower and the mugginess backing off. On Sunday, temperatures are expected to climb back to the low and mid-90s, but the humidity should not approach the Thursday and Friday levels.

Temperatures around game time are forecast to be in the upper 80s with comfortable humidity and a breeze under 10 mph.

The only caution flag would be the chance of a shower, said Mike Lee, a meteorologist at the weather service office in Mount Holly, but “it looks like it’s going to be on the hit-or-miss side of things.”

It should be comfortable for the fans, but upper 80s would not be a cool dip in the pool for the players, who can run six miles or more during a match — no home run trots in soccer. Throughout the tournament, heat and humidity certainly are going to be players, said Ryan Calsbeek, a runner and Dartmouth College biological sciences professor.

He allowed that running this week was an ordeal. Granted, it got up to only 85 degrees where he lives in New Hampshire, but it was the first warm shot of the season, and his body let him know it was not enjoying the adjustment. Acclimatization certainly will be a challenge to the World Cup participants at the venues across the United States, Canada, and Mexico, he said.

The atmospheric conditions on Sunday in Philly are not going to feel much like home to either team.

The Ecuadorians may even get a little homesick. They play in Quito, right on the equator, but their stadium is at an elevation of more than 9,000 feet — 1.7 miles. Temperatures decrease with height, and the average high in June in Quito is 70 (the same as it is in January).

Conversely, the Ivory Coast team’s home field is in Abidjan, a city of more than six million on the south-central Atlantic coast. The region gets prodigious amounts of rain as storm waves move across east to west across the continent, said Tom Kines, senior meteorologist with AccuWeather Inc. And is it ever muggy.

Les Elephants might view South Philly as a vacation spot.