Youngsters play in water fountains in Warsaw that have been put up to help people fight the extreme heat of up to 35C that has gripped Poland for five days. Photo: Czarek Sokolowski. Expand

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Youngsters play in water fountains in Warsaw that have been put up to help people fight the extreme heat of up to 35C that has gripped Poland for five days. Photo: Czarek Sokolowski.

Youngsters play in water fountains in Warsaw that have been put up to help people fight the extreme heat of up to 35C that has gripped Poland for five days. Photo: Czarek Sokolowski.

Youngsters play in water fountains in Warsaw that have been put up to help people fight the extreme heat of up to 35C that has gripped Poland for five days. Photo: Czarek Sokolowski.

Thunderstorms brought a much-needed cool down to parts of Western Europe over the weekend as the continent sweltered under its first summer heat wave.

However dozens of people were reported drowned as they sought relief from the heat.

Forecasters predicted further downpours moving east toward Poland, which has seen five days of unusually hot weather.

Germany's national weather service DWD said temperatures in the west and north of the country dropped from over 30C over the weekend to about 20C after a night of heavy rain.

After days of soaring temperatures, France was lashed by violent thunderstorms that sent a belltower crashing into the nave of a village church in central France.

The storm also tore through vineyards and flooded homes and public buildings.

Winds reached 137kmph in Champagne country, felling trees and ripping off roofs.

Huge hail stones damaged cars and homes in the east, and the French national weather service registered 44,000 lightning flashes on Saturday alone.

No deaths linked to the storms have been reported but several countries reported drownings as people sought relief in pools, lakes and rivers.

At least 15 people drowned in Poland over the weekend, which was also the hottest so far this year with temperatures reaching 35C.

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Rescuers say the most frequent causes of drownings are recklessness, overestimating one’s swimming abilities and going into the water after drinking alcohol.

Police in the Netherlands said two bodies were found in recent days at different locations in the Waal River, a branch of the Rhine. There was no immediate confirmation of their identities, but police in neighboring Germany said their descriptions matched those of two girls, aged 13 and 14, who went missing while swimming in the Rhine near Duisburg last week. A third teen was pulled out of the river Wednesday but couldn't be resuscitated.

In total, more than a dozen people have drowned in Germany over the past week.

Police in Austria said a 26-year-old man died on Sunday after jumping from a 131ft cliff at Wolfgangsee lake.

Moscow has also been hit with a heatwave, with temperatures spiking above 30C on Sunday. Russia’s weather agency Rosgidromet warned that the unusually hot weather, with temperatures 7C to 10C higher than normal, is likely to persist in the Russian capital and the surrounding region until Friday.

Russia’s public health watchdog recommended that employers cut working hours by one hour if the temperature indoors reaches 28.5C; by two hours if it reaches 29.5C and four hours if it reaches 30.5C.

Greece’s National Meteorological Service has forecast temperatures between 38 and 41C from Wednesday until Sunday, when temperatures in the north of the country are due to recede slightly. Although it is common for temperatures to hit the 40C range in the summer in Greece, it is unseasonal to have such hot weather this early in the year.

The European Commission said on Monday it is readying a fleet of 11 water-dropping planes and six helicopters around the bloc to help member nations cope with forest fires in the coming months.

“The season’s risk for forest fires is forecast to be above average, with temperatures expected to be higher-than-average from June to September in the Mediterranean region,” the Commission said.

“The season might also see less rainfall, especially in Central Europe and many areas of the Mediterranean. This can increase the risk of wildfires."