Kelps form the foundations of diverse and productive coastal ecosystems. However, marine heatwaves (MHWs) are increasing in frequency, duration and intensity, posing a threat to kelp survival and ecological function. MHWs have already caused detrimental effects on kelp dominated ecosystems, for example an estimated 43% decline of E. radiata along the Western Australian coastline in 2011, leading to the proliferation of turf algae, which persist as dominant reef inhabitants. Despite their critical importance, the physiological responses of kelps during repeated MHW exposures and subsequent recovery phases remain poorly understood. This study investigates molecular, physiological, and organismal level responses of E. radiata to repeated MHW exposures subsequent recovery periods. We compared the physiological and differential gene expression responses of E. radiata exposed to two consecutive MHWs (15 °C + 5 °C for 6 days) including subsequent recovery periods (15 °C for 7 days). In an era of rapid global change, this study represents an advancement in comprehending the fundamental mechanisms that underlie responses to MHWs. It strengthens our predictive capacity regarding the fate of kelps, which is pivotal for effective management strategies.