Europeans suffering for the past week from Sahara-like weather "could see a drop in temperatures from August 15," said Dominique Escale, meteorologist for France's national weather service Meteo France.

From Manchester to Madrid, temperatures have regularly risen to the uncomfortable mid to upper 30s Celsius throughout the week, with several cities topping 40 degrees Celsius (104 degrees Fahrenheit).

The blistering heat coupled with severe drought have helped whip up forest fires in several countries, with weary firefighters still struggling on Friday to rein in blazes in Portugal, Italy and France.

Sixteen people have succumbed to the steamy heat in Spain, while 20 others have been killed in devastating fires in France and Portugal, bringing the total summer death toll to three dozen in the space of two weeks.

On Friday, firefighters battled fresh blazes in central Portugal while the government in Lisbon continued its drive for much-needed international aid. In France, fires continued to ravage woodlands off the Mediterranean coast.

The forest fires have destroyed around 175,000 hectares (430,000 acres) of pinewood and brush across the continent, more than half of it in Portugal.

Europe's farmers were also suffering: producers in parts of the German state of Brandenburg said they could lose up to 80 percent of their crops, while French poultry farmers southeast of Paris and in the western Brittany region said they had lost more than 150,000 chickens.

Not everyone was complaining about the weather, which has proved a boon for sellers of ice cream, fans and air conditioning units, as well as the owners of movie theaters, shops and museums that offer the advantage of cool air.

Some tourists in Paris sought relief in unusual spots like the chilly catacombs, where officials said they were forced to turn back visitors due to a quota of 1,000 entries a day.

"Some people are dragging out their visits so much that we've had trouble getting them to leave when we close," said employee Jean-Michel Sommereau of the tourist site, where the mercury was at 15 degrees Celsius (59 Fahrenheit).

At the Villeneuve-les-Maguelone prison in southern France -- recently home to militant farmer Jose Bove -- workers were installing showers in the prison courtyards to keep inmates and their tempers from getting overheated.

The heat wave was caused by an anticyclone which has anchored itself firmly over the west European land mass, holding off rain-bearing depressions over the Atlantic and funnelling hot air north from Africa.

Though there was no clear evidence putting the blame on global warming and greenhouse gas production, scientists at the World Meteorological Office point out that the world's 10 hottest recorded years have all taken place since 1987.

"The evidence seems to point to human factors -- that's basically the concentration of greenhouse gases," said Rajendra Pachauri, the head of a United Nations scientific panel on climate change.

"The danger is that these extreme events will increase in the future. So this is a warning of sorts of what we're likely to get in the future," Pachauri added.

SPACE.WIRE