Houston, Texas is entering what public health officials and climatologists predict will be another punishing summer — and the city's healthcare infrastructure is facing a heat-related illness burden that has grown by 329% in just six years. That figure, drawn from a landmark study by Harris County Public Health, is not a projection or a model estimate. It is the documented, real-world increase in heat-related emergency room visits between 2019 and 2023. As the 2026 summer season begins, there is every reason to believe the trend will continue upward.
The Houston Health Department (HHD) has launched its annual Summer Surveillance program, tracking heat-related illness (HRI) across Harris, Fort Bend, and Montgomery counties through an interactive dashboard that monitors daily temperature and health data. The dashboard is designed to identify vulnerable populations and formulate protective interventions — but surveillance is only as valuable as the policy response it triggers. And so far, Houston's policy response to the growing heat crisis has lagged dangerously behind the data.
