With the 2026 World Cup starting June 11, a U.S. analysis using a heat-stress threshold tied to FIFA player-safety guidance flags Houston, Miami and Dallas as the host cities most often exceeding Wet Bulb Globe Temperature (WBGT) levels associated with real he
By the time the 2026 World Cup kicks off on June 11, the debate won’t just be about tactics. It will be about heat—what it does to players, and how hard host cities will have to work to keep people safe.
A new U.S. analysis counting how often World Cup venues exceeded a heat-stress threshold during past tournaments found Houston. Miami and Dallas have the most frequent history of outdoor heat burden during the World Cup window. The figures come as multiple studies have warned that high-heat and high-humidity conditions could affect a significant share of matches. forcing organizers to navigate an awkward gap between player-safety guidance and FIFA’s existing regulations.
The threshold at the center of the latest scrutiny is an estimated Wet Bulb Globe Temperature of 78.8 degrees Fahrenheit (26 degrees Celsius). A global players’ union, FIFPRO, says heat strain becomes a real risk at that level. At 82.4 degrees Fahrenheit (28 degrees Celsius), FIFPRO recommends delaying or postponing play.
But FIFA’s current rules do not consider postponement until 89.6 degrees Fahrenheit (32 degrees Celsius) WBGT.
For the 2026 tournament, FIFA will include three-minute hydration breaks for all 104 matches, scheduled 22 minutes into each half. The latest U.S. analysis—focused on outdoor heat patterns near the venues—builds on broader research that suggests the World Cup’s hottest moments may be more frequent than many fans expect.
In May. World Weather Attribution released a report analyzing the potential impact of heat at the World Cup and warned that roughly one in four matches could be played in risky heat conditions. Shortly afterward. an analysis calculated the most risky games for hot weather and found as many as one-third of matches face high risk for hot and humid conditions. Bloomberg also published a visual track of teams’ schedules tied to increasing heat exposure.
The U.S. analysis adds a venue-by-venue lens based on recent conditions. It counted the number of days during the World Cup period from 2016–25 when each host venue exceeded the 78.8 degrees Fahrenheit (26 degrees Celsius) WBGT threshold. It estimated shaded or sheltered WBGT using hourly ERA5-Land temperature and dewpoint data from the European Union’s Copernicus program.
The results place Houston, Miami and Dallas at the top of the risk list.
Houston appears first in the study’s outline of recent outdoor burden, followed by Miami and then Dallas. Miami’s Hard Rock Stadium is described as notably outdoors—and it will host three matches in July. including a quarterfinal and the third-place match. Hard Rock Stadium has cracked 78.8 degrees Fahrenheit WBGT on 90% of the analyzed days. according to the analysis. ranking second only to Houston at 94.1%.
Dallas, which will host the semifinals, broke 78.8 degrees Fahrenheit WBGT on 87.9% of analyzed days. Atlanta also appears in the elevated exposure list, hitting the 78.8 degrees Fahrenheit threshold 46.2% of the time. Both Atlanta and Dallas are described in the U.S. analysis as climate-controlled venues.
The gap between “outdoor risk” and “in-stadium control” shows up sharply in the way the final is described. The final will be outside, but the host venue in East Rutherford, New Jersey, only broke the threshold 20% of the time.
Still, even the cities with indoor or climate-controlled stadiums may not get full protection from heat. World Weather Attribution specifically noted that fans “may also be adversely affected by elevated WBGTs.” That matters because travel and time spent around stadiums can expose spectators to the same kind of heat stress that players face.
The analysis also points to specific places that did not clear the safety threshold during the analyzed period. Three host cities—Mexico City, Guadalajara and Toronto—failed to reach the threshold in the June 11–July 19 window across 2016–25.
Heat isn’t new to World Cup hosting. In Brazil during the 2014 men’s tournament, FIFA introduced cooling breaks when weather reached 89.6 degrees Fahrenheit. And in Qatar, the World Cup was staged in winter to avoid the country’s most punishing weather.
For the 2026 tournament. the latest analysis draws a clear line between what the players’ union views as a risk level and what FIFA currently treats as a postponement trigger. At 78.8 degrees Fahrenheit, FIFPRO says heat strain becomes a real risk. At 82.4 degrees Fahrenheit, it recommends delaying or postponing play. FIFA’s postponement threshold remains at 89.6 degrees Fahrenheit.
In the background, there’s also a timing element: the U.S. analysis says heat burden generally worsened in July. That’s a particular problem for Miami. which is set to stage multiple high-stakes matches in a stadium described as outdoors and with a high frequency of exceeding the 78.8 degrees Fahrenheit WBGT threshold.
The sequence the data suggests is straightforward: during the World Cup window. certain cities repeatedly surpassed the same heat-stress line. and the calendar pushes many of the biggest matches into the month when the burden intensifies. The staging details then determine whether that exposure shows up inside the venue—or follows people to the gates and sidewalks instead.
Methodologically, the U.S. analysis is careful about what it does and doesn’t measure. It analyzed hourly ERA5-Land temperature and dewpoint data near each 2026 host venue from June 11–July 19 in 2016–25. estimating shaded or sheltered WBGT via an indoor/no-solar-load WBGT approximation. The results show outdoor conditions near each venue, not conditions inside stadiums or under direct-sun field conditions.
For fans and organizers alike. the real-world takeaway is that the question is not whether the World Cup will ever face dangerous heat. The question is which host cities will most often bring it to the doorstep—then how quickly rules. hydration breaks. and scheduling decisions can respond when the numbers cross the lines that player-safety experts have already flagged.
2026 World Cup heat risk WBGT 78.8 degrees FIFPRO heat strain Houston Miami Dallas Hard Rock Stadium outdoor FIFA hydration breaks Copernicus ERA5-Land World Weather Attribution