The Extreme Heat Emergency Act of 2025 expands the federal government's ability to respond to dangerous heat waves by officially classifying extreme temperature events as "major disasters" under the Robert T. Stafford Disaster Relief and Emergency Assistance Act. This change allows states and communities experiencing severe heat emergencies to access federal disaster assistance programs, emergency funding, and support services that were previously unavailable for heat-related emergencies. The bill, introduced by Senators Jacky Rosen and Mark Gallego, primarily affects state and local governments, emergency management agencies, and communities in regions prone to extreme heat events. The legislation requires no additional federal funding, as it only modifies the existing definition of covered disasters without authorizing new appropriations.