Ahead of and during the 2026 World Cup, multiple reports highlight that extreme heat and volatile weather are major concerns for players, spectators, and event workers across host venues in the United States, Mexico, and Canada. Several outlets cite climate briefings and reports suggesting a substantial share of matches—ranging from about 25% to specific estimates such as 26 of 104—could be played in dangerously hot conditions. Temperatures and heat indices are expected to reach very high levels in parts of the Midwest and East Coast, with some forecasts describing “heat dome” conditions that push values to roughly 105–115°F (about 40–46°C). Cities named across coverage include Toronto, Kansas City, New Jersey, Philadelphia, and other venues in the southern and eastern US. In addition to heat, thunderstorms and lightning pose risks: matches can be delayed or suspended under stadium safety rules when lightning is detected within roughly 8 miles, with play resuming after a set delay. Outlets also note that FIFA and organizers have limited precedent for such conditions and may need additional measures to protect health, including adjustments around kickoff times and cooling and hydration practices.