Ninety-nine people drowned in Germany last month, the most since a record heatwave swept Europe in 2003, according to official figures.

Germany was among the nations hit by a stifling June heatwave in western Europe, which set temperature records in several places across the country as the mercury rose as high as 41.7C.

The country "had not registered this many drownings since the heatwave of June 2003, when 107 people died", the national lifeguarding federation (DLRG) said Sunday in a statement.

Last month's heatwave brought wildfires, rail travel chaos and an increased mortality rate in Germany.

The drowning victims were largely young men, the federation said.