Temperatures higher than average may even put healthy individuals under stress and trigger health problems, Cecilia Muller said in a statement.

All social institutions are obliged to accommodate the homeless and anyone else suffering because of the heat, an official of the Ministry of Human Resources (EMMI) told a press briefing on Wednesday.

Members of the public are also asked to help by notifying the authorities if they spot a homeless person in distress on the street.

According to the recommendation, people should stay indoors from 11 am to 3 pm, should avoid strenuous activity and direct sunlight; wear loose, lightweight clothing; drink plenty of fluids, watch for heat cramps, heat exhaustion and heat stroke and never leave people or pets in a closed vehicle.

The alert has been issued based on data available from national weather service OMSZ and the recommendations of the National Public Health Centre (NNK).