The heat crisis has arrived earlier than ever. America is facing an extreme heat emergency in 2026, and it started months before summer. The U.S. just experienced its hottest 12-month period on record since 1895, with March 2026 marking the most abnormally hot month in 132 years of records. 

This isn’t just another hot year. We’re witnessing a fundamental shift in when, where, and how dangerously hot America gets.  The numbers are staggering. March 2026 averaged 50.85°F — that’s 9.35°F above the 20th-century average, making it the first time ever any month has averaged 9+ degrees above baseline. Daytime highs were 11.4°F above normal, nearly matching typical April temperatures. In just one month, nearly 20,000 daily heat records were broken across the country, and more than 2,000 locations set monthly heat records, more than entire decades in previous years. Ten states experienced their hottest March on record: Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oklahoma, Texas, Utah, and Wyoming. Half of all counties in the continental U.S. — 500 counties — had their hottest March ever. 

The human toll is already unfolding. Forty-two and a half million people across the western U.S. experienced at least one day with extreme climate-influenced heat during the March 24-27 heatwave. Fifty million people faced temperatures surpassing 90°F in May 2026, with another 11 million reaching 100°F. Nearly 30 million people on the East Coast faced “High Risk” heat levels in June 2026. The heatwave brought July-like heat to millions in March, unseasonable by 20 to 35 degrees above average. 

Extreme heat now kills more people in the United States than any other weather-related hazard, yet it receives far less attention than hurricanes, wildfires, or floods. Heat-related deaths increased 117 percent from 1999 to 2023, jumping from 1,069 to 2,325 deaths. Heat-related mortality rates increased 16.8 percent per year from 2016 to 2023. For older adults age 65 and up, heat waves caused about 9 extra deaths per heat wave per 10,000 people each year. Across 2000 to 2018, this added up to 17,600 extra deaths among older adults. The mortality burden is nearly three times higher for Black individuals than white individuals. 

America’s healthcare system is being overwhelmed by this crisis. Phoenix confirmed its first 2026 heat death in April, before summer even started. Houston’s heat-related ER visits surged 329 percent since 2019. By 2040, projections show heat-related hospitalizations could double to between 217,000 and 237,000 annually. While heat strikes silently without dramatic sirens, evacuation orders, or visible destruction, just deadly temperatures. It is indiscriminate, affecting outdoor workers, older adults, low-income communities, and those without reliable access to cooling. Hazardous heat conditions are also linked to extreme disparities, with highest risk groups experiencing heat-related illness at rates 12 to 57 times higher than lowest-risk groups, and Black communities facing three times higher mortality. Poverty-dense areas report 11 extra deaths per 10,000 people per heat wave.  

This is where Healthcare Ready’s work becomes especially relevant. Extreme heat puts pressure on the systems people rely on every day, and HcR helps healthcare and community partners prepare with practical guidance, readiness resources, and communication tools that support planning before a crisis unfolds. Our own extreme heat tip sheet, for example, offers personal preparedness steps, cooling center guidance, and hotline numbers for heat related emergencies, helping people stay safer before peak heat season. That kind of behind-the-scenes coordination matters, especially when the impacts of heat are widespread, unequal, and often harder to see until they are already straining hospitals and communities. And this work is even more urgent now because the problem is getting worse, and faster, than many people realize.  

With heat getting worse everywhere, not just in isolated regions. Eight in ten cities have experienced an increased heat index at or above 90°F since 1985. Cities are hitting their first 90-degree day earlier and seeing the last one later. Longer streaks of 90-plus heat days are becoming normal. The South, Southwest, and Southeast saw the sharpest increases. Sixty percent of the country was in drought conditions by March 31, 2026, exacerbating temperatures even further. This is not random variation, though it is a pattern driven by something larger.  

Climate change is making this worse at an alarming pace. The March 2026 heatwave would have been virtually impossible without the climate crisis. Climate change made this extreme heat at least five times more likely to occur. Such heatwaves are now four times more likely than in the past decade. Six of the 10 most abnormally hot months in U.S. history have occurred in just the past decade. And this trend is pointing directly into the summer we are heading into now.  

Forecasters predict that the El Nino this summer could be the most intense heat since last summer, with potential to shatter multiple records. Triple-digit temperatures are expected in Kansas, Nebraska, and South Dakota at 100 to 102°F. East Coast records are likely to fall from New York to the Carolinas. Heat index readings of 95 to 100°F are expected in New York City and surrounding areas. Prolonged warmth will continue in the western U.S. into late June, and a hot summer with multiple heat waves are predicted across most of the contiguous United States with almost no areas expected to have temperatures below historical averages. With that kind of forecast, communities cannot wait until the heat arrives, they need to act now.  

By communities investing into green spaces and trees immediately, ZIP codes with the highest green space saw 13.51 fewer deaths per 10,000 people per heat wave. Resources must target Black communities and high-poverty neighborhoods facing disproportionate impacts. The CDC Heat and Health Tracker provide local heat data and identifies risk populations. Healthcare systems must prepare for surging ER visits before summer peaks. 

The data is clear: 2026 is already record-breaking, and summer hasn’t fully arrived. With nearly 20,000 heat records shattered in March alone, 42.5 million people exposed to climate-driven extreme heat, and ER visits surging 329 percent in hot cities, America faces a heat crisis that demands immediate action. We are ready to help communities prepare, respond, and build resilience against this growing threat. Because when extreme heat hits, preparedness saves lives.