The heat index, which combines air temperature and relative humidity to determine the felt air temperature, will exceed the critical threshold of 80, the National Meteorology Administration said.
The advisory covers capital Bucharest, and counties Ialomita, Calarasi, Ilfov, Giurgiu, Teleorman, Olt, Dolj, Mehedinti, Caras-Severin, Timis, Arad, Bihor, Alba, and Hunedoara.