The National Weather Service has warned of "searing heat and oppressive humidity that occurs during the 'dog days of summer'." ...

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

High temperatures across the Plains, Midwest, mid-Atlantic and Northeast are expected to hit at least 15 degrees above normal ...

CNN is tracking extreme heat conditions for Americans each day. See where the risks are greatest — and where high temperature records might be broken.

At least nine states along the East Coast faced summer swelter on Monday, and the steamy weather is expected to persist on ...

Floridians can expect even more heat this weekend thanks to a heat dome blanketing the sunshine state - creating dangerous ...

It's going to be an uncomfortable weekend for many in the US: As of Friday, an estimated 104 million people are under heat warnings and advisories.

As previous disasters have laid bare the US’ vulnerabilities to other types of extreme weather, this week is revealing strains in infrastructure and highlighting public health risks when faced ...

When will the current heat waves end? Persistent extreme heat is what's in store for the foreseeable future across much of the country, with no significant cool-down in sight, forecasts show.

A brutal heat wave across the eastern United States trapped millions of people in sweltering air this week with record-high temperatures.

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.