US Heat Dome 2026
June 29 – June 30, 2026 Updated 10h ago
Heat dome to bake eastern US through July Fourth, threatening hundreds of records
A powerful heat dome is building over the central and eastern United States, putting some 200 million people under dangerous heat with triple-digit highs forecast in Washington, Philadelphia and beyond, peaking over the July Fourth weekend.
Extreme heat warnings cover 47 million from Midwest to East Coast into July 4 week
About 47 million Americans across the Midwest and Ohio Valley were under extreme heat warnings Tuesday, with heat indexes near 105 in Chicago and Minneapolis as the dangerous dome of heat spreads east and threatens records through the July 4 holiday.