Elsewhere in Europe, heat alerts remain in place in France, Spain, Portugal, Italy and the Balkans, with temperatures expected to soar above 40C (104F) in some regions.
Slovenia reported its warmest ever night, with temperatures in one port not dropping below 28C.
One child died of heatstroke in Italy on Monday, where temperatures of 40C are expected to hit later this week. Red heat alerts were in place for at least 10 Italian cities, including Rome, Milan and Florence.
A four-year-old Romanian boy, who was found unconscious in a car in Sardinia was airlifted to a hospital in Rome but died due to irreversible brain damage, reportedly caused by heatstroke, medical authorities told AFP.
France’s Health Minister Catherine Vautrin said hospitals were braced for fallout from the country’s second heatwave in just a few weeks.
In Montenegro, a soldier died and another was seriously injured when their water tanker overturned while battling flames n the hills north of the capital, Podgorica.
In Portugal, firefighters battled three large wildfires, including a large blaze in Trancoso in the centre of the country.
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