Forecasters warn of additional forest fires as temperatures are expected to rise to 44 Celsius with winds of 24-32 km/h.
Record breaking temperatures force Europeans out on to beaches, lakes, and fountains to cool off.
Tour de France cyclists will face temperatures above 40 degrees Celsius over the next three days.
US weather agency says a swath of the East Coast, from the Carolinas up to Maine, faces the greatest heat threat as daytime highs are expected in the mid-to-upper 30s, which, coupled with high humidity, will feel like 38 to 43 degrees Celsius.
Europe is currently in the throes of a heatwave that is expected to get even worse with temperatures expected to cross 40 degrees Celsius today. Here are some of the images of how Europeans are dealing with the heat.
Europe is in the midst of its worst heatwave since 2003, as 2018 shapes up as one of the worst years on record. Scientists point to people-made climate change as the problem, and they say it's only going to get worse unless politics changes.
Heatstroke kills three people in Spain as the most severe heatwave grips the continent with temperatures touching a scorching 45 degrees Celsius in some areas.
"We will have to get used to these kinds of summers," says Friederike Otto of the Environmental Change Institute at Oxford University, as countries across Europe swelter in the continent's hottest weather of the past three years.
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