Weather authorities said temperatures are expected to reach 36-38 degrees Celsius and even 39 degrees Celsius in isolated areas.
They also said that Sunday afternoon, temperatures are expected to reach 35-37 degrees Celsius in western and central regions and the heat index, which combines air temperature and relative humidity to determine the felt air temperature, will exceed the critical threshold of 80.
The orange code alert targets Bucharest and counties Dolj, Olt, Teleorman, Giurgiu, Ilfov, Calarasi, Ialomita, Constanta, Tulcea, Braila, Galati, Vaslui, Iasi, Botosani, Neamt, Bacau, Vrancea, Buzau, Prahova, Dambovita, Arges and Valcea.