In the summer of 2024, researchers at Boston University School of Public Health partnered with A Better City, the City of Boston’s Office of Climate Resilience, and The Boston Foundation to launch a pilot program to address the data gaps in measuring ambient temperature across Boston’s hotspot neighborhoods. With funding from The Boston Foundation, this multi-sector (non-profit, government, academic) collaborative research project was able to provide data from environmental justice neighborhoods to guide action specifically on extreme heat emergency management. Currently, there is only one National Weather Service temperature sensor in the City of Boston, located at Logan Airport, which determines the official temperature for the entire city that is then used to predict extreme heat emergency declarations. However, this study’s results confirm that temperatures in some hotspot neighborhoods are reaching the threshold used to declare emergencies sooner and more frequently. These results demonstrating significant differences in how hotspot environmental justice neighborhoods experience and become exposed to high heat could inform other cities’ heat emergency preparedness and response, and be used to guide local governments in equitably addressing the neighborhood-scale disparities of extreme heat in urban areas.