Photo: Shutterstock Bad news ahead of World Cup: Large parts of the United States are set to experience a significant surge in temperatures this week, with forecasters warning of above-average heat across much of the Lower 48 states.
According to the National Weather Service, temperatures across portions of the northern and central Plains could climb 20 to 25 degrees Fahrenheit above seasonal averages during the early part of the week.
The heat is then expected to spread eastward, bringing unusually warm conditions to other regions.
“Temperatures will be above average for many this week across the Lower 48,” the National Weather Service said, adding that high temperatures in parts of the Northeast are forecast to reach “well into the 90s” by Thursday.
The developing heat wave could affect millions of residents and travelers, particularly in areas where temperatures have remained relatively moderate in recent weeks.
The warning comes as summer travel begins to accelerate across the United States, with high temperatures potentially impacting outdoor events, including the upcoming FIFA World Cup, sightseeing activities, and transportation operations in some areas.
The U.S. host cities that will stage World Cup matches this week are:
Forecasters expect temperatures in the Boston area to climb into the upper 80s and low 90s around June 12–13, with a broader heat event affecting New England. Some inland locations could experience multiple days near or above 90°F.
Photo: Joe Tabacca / Shutterstock.comThe National Weather Service has urged the public to follow local forecasts and heat-related advisories as conditions evolve throughout the week.
Young children, infants, older adults, pregnant women, and people with chronic medical conditions face a higher risk of heat-related illnesses during extreme heat events. Experts recommend drinking plenty of water throughout the day, even if you do not feel thirsty, wearing lightweight and loose-fitting clothing, avoiding strenuous outdoor activities during the hottest hours, and seeking air-conditioned spaces whenever possible. Those spending time outdoors should take frequent breaks in the shade and use sunscreen, as sunburn can reduce the body's ability to cool itself.
Authorities also encourage residents to check on elderly relatives, neighbors, and anyone who may have limited mobility or lack access to air conditioning. Meals should be kept light, and perishable foods should not be left in the sun or hot vehicles.
One of the most important safety reminders concerns children and pets in vehicles. According to U.S. safety data, 31 children died in hot cars in 2025 alone. Experts stress that it is never safe to leave a child, disabled person, or pet in a parked vehicle, even for a few minutes and even if the windows are cracked open.
Vehicle temperatures can rise rapidly to dangerous levels, potentially becoming fatal in as little as 10 minutes. Parents are also advised to keep vehicles locked when not in use, as children can accidentally enter parked cars while playing.
Health officials say taking simple preventive measures and recognizing the signs of heat exhaustion and heat stroke can help reduce the risks associated with what is expected to be a prolonged period of unusually high temperatures across much of the United States.