Large areas of the Mediterranean sweltered under an intense summer heat wave on Tuesday and firefighters battled to put out blazes across the region.

In Algeria, at least 34 people have died. In Croatia, flames came within 12 kilometers of the medieval town of Dubrovnik late on Tuesday.

Greece has been particularly hit hard, with authorities evacuating more than 20,000 people in recent days from homes and resorts in the south of the holiday island of Rhodes.

Close to 3,000 tourists had returned home by plane as of Tuesday, according to figures from the Transport Ministry, and tour operators have cancelled upcoming trips.

Two firefighting pilots died when their plane, which had been dropping water, crashed on a hillside close to the town of Karystos on the island of Evia, east of Athens.

Italy suffered a twin pounding from the elements when severe storms battered the north, killing a woman and a 16-year-old girl scout, while southern regions sweltered. In the south, a bedridden 98-year-old man died when fire swept through his home.

Fires also swept across Portugal and Spain's Gran Canaria.

In the U.S., the ocean waters around South Florida soared to typical hot-tub levels this week, according to government data. A weather buoy in the waters of Manatee Bay recorded a high of 38.44 degrees Celsius late Monday afternoon, according to National Oceanic and Atmospheric Administration data. On land, heat warnings were issued for stretches of the desert southwest, in central Texas and north into the Midwest.

Extreme weather throughout July has caused havoc across the planet, with record temperatures in China, the U.S. and southern Europe sparking forest fires, water shortages and a rise in heat-related hospital admissions.

Without human-induced climate change, the events this month would have been "extremely rare," according to a study by World Weather Attribution, a global team of scientists that examines the role played by climate change in extreme weather.

The heat, with temperatures topping 40 degrees Celsius, is well in excess of what usually attracts tourists who flock to southern European beaches.

The high temperatures and parched ground sparked wildfires in countries on both sides of the Mediterranean.

Several dozen firefighters were using aircraft to battle a wildfire that had broken out close to Nice international airport in southern France.

In northern Africa, Algeria was fighting to contain devastating forest fires along its Mediterranean coast in a blaze which has already killed at least 34 people. Fanned by strong winds, fires also forced the closure of two border crossings with neighboring Tunisia.

Wildfires also broke out in the countryside around Syria's Mediterranean port city, Latakia, with the authorities using army helicopters to try to put them out.

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