According to Slovakia's weather service, the country registered a new record high of 41.3°C, surpassing the previous all-time high of 41°C set just a day earlier. The new record was measured in Kamenica nad Hronom, in southern Slovakia near the Hungarian border.

Across the border, the temperature reached 42C in Szecseny, beating a previous record of 41.9C from 2007, the HungaroMet national weather service said in a Facebook video.

Restrictions on water consumption have been imposed on some municipalities in both countries, which have been on the highest heat alert level for days.

Several places, including the central city of Nitra, are facing shortages of drinking water, with tanker trucks brought to supply people with water.

In a hilly Hungarian village northwest of Budapest, people brought plastic containers and bottles to fill up water at a roadside water cart in scorching 41C heat as taps have run dry.

"It's mainly to quench our thirst, and we have to give our animals water too," Andras Arki, a 23-year-old student, told AFP.

Hungarian Prime Minister Peter Magyar has urged people to moderate their water consumption and forego non-essential use, such as watering lawns and washing cars.

All-time temperature records have tumbled across Europe in a severe heatwave that has lasted more than a week.