The paper deals with the fatigue behaviour at elevated temperature of Reinforced Concrete (RC) slabs strengthened with Externally Bonded (EB) Carbon Fibre Reinforced Polymer (CFRP) strips focusing on bridge deck slabs belonging to lateral cantilevers of highway concrete box-girder bridges. These elements could reach elevated temperatures during the summer period when they are directly exposed to the solar radiation. Besides, these structural elements are able to suffer fatigue damage when they are subjected to high number of cyclic loads. Most of the existing experimental works in the literature have shown that the typical fatigue failure at room temperature happens due to fatigue failure of the longitudinal steel reinforcement followed by strip debonding. At elevated temperature, a different type of failure could happen due to the softening of the epoxy properties.