safety
Heat dome to scorch major U.S. cities this week. Maps show the forecast and warnings.
By CBS Miami at CBS4 Miami
· June 30, 2026
· 4 min read
A long and dangerous heat wave will blast a large swath of the United States this week, the National Weather Service said, with temperatures rising ahead of the July Fourth holiday and feeling even hotter because of the high humidity that's arriving with it.The heat dome is expected to build over th
Key takeaway , among cities expected to see record highs into the 100s, according to CBS News meteorologist Nikki Nolan.
Why this matters in The Miami
Miami residents can expect to feel the effects of the heat dome, even if the city isn't forecast to reach the same record highs as other parts of the country. The high humidity that comes with the heat wave will make temperatures feel even more oppressive, particularly in neighborhoods like Little Havana and Wynwood, where the urban heat island effect can exacerbate the heat. As the city prepares for the July Fourth holiday, residents should take precautions to stay cool and hydrated, especially in areas with limited access to air conditioning or shade. The heat wave also serves as a reminder of Miami's vulnerability to extreme weather events, including hurricanes and sea-level rise, which can further exacerbate the city's flooding and heat risks. As the heat wave persists, Miami-Dade County officials should be prepared to respond to any heat-related emergencies and provide support to vulnerable populations.
About this story
Original reporting by CBS4 Miami . The Miami surfaces reporting from trusted publishers and adds local editorial context so readers can quickly understand what a story means for their community. We attribute every source, link to the original report, and follow a documented editorial standards policy. To understand how stories are selected and reviewed, read our about page .
For the complete original report, visit CBS4 Miami . Have a tip or correction? Contact our newsroom .
Category: safety ·
Published: June 30, 2026 ·
Source: CBS4 Miami ·
Reading time: 4 min
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Frequently asked about this story
What is this story about? A long and dangerous heat wave will blast a large swath of the United States this week, the National Weather Service said, with temperatures rising ahead of the July Fourth holiday and feeling even hotter because of the high humidity that's arriving with it.The heat dome is expected to build over th
When was this published? This article was first published on June 30, 2026 by CBS4 Miami and curated for The Miami readers.
Who reported this story? This story was reported by CBS Miami at CBS4 Miami. To learn more about how The Miami selects and reviews stories, see our editorial standards .
Where can I find related coverage? See more safety coverage from The Miami, or browse our daily briefing and topic hubs .
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