The peak average highs for many in the United States are hit in July or early August, but in some locations it's as early as June or as late as early fall.

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

View the latest weather forecasts, maps, news and alerts on Yahoo Weather. Find local weather forecasts for Chicago, United States throughout the world ...

A heat dome​ is trapping over 90 million Americans in extreme temperatures this week with the National Weather Service​ issuing heat alerts from Nebraska to Florida.

Extreme heat warnings are in effect for parts of Arkansas, Missouri, Illinois, Kentucky, Tennessee, Mississippi and Louisiana.

Millions of Americans are under weather advisories this week. See which major cities have heat, flood or storm advisories.

Almost 85 million Americans from South Dakota to Texas and North Carolina to Florida are already under extreme heat warnings, watches or advisories.

Weather maps show chilly conditions could hit the UK in August with some places set to see a huge drop in temperatures. After ...