The Hellenic Red Cross received a warning from the National Observatory of Athens (NOA) concerning a heat overload at “Danger Level 4″. The risk of very high temperatures is anticipated from Tuesday, 12 June 2024 and Wednesday, 13 June 2024. As the heatwave occurs at the beginning of the summer, severe impacts are anticipated since citizens are not prepared for such an extreme change in the environment and they are unable to gradually adapt to the increasing temperature. Considering all risk parameters, the HRC has decided to active the Greece Extreme Heat sEAP. Early actions will be carried out in Attica (Athens – Piraeus), Thessaloniki, and Patra. The early actions will be implemented from Monday, 10 June 2024 and will continue throughout the week depending on the notifications of the National Observatory of Athens. By implementing carefully planned prevention and early response actions, while prioritising societal and environmental needs, HRC is urged to take proactive steps to mitigate the impacts of rising temperatures. Actions taken by the Hellenic Red Cross will enhance community resilience and elevate public awareness.