In the absence of currently available scientific literature on the interaction between heat waves and COVID-19, the information presented in this note reflects the state of knowledge as of June 22, 2020, drawing primarily on national opinions and recommendations, in particular all opinions issued by the High Council for Public Health (HCSP). They are supplemented by reports from European and international institutions. The information presented in this note is subject to change depending on the evolution of available data. This summary does not cover all the measures implemented to prevent heatwaves or combat the COVID-19 pandemic, particularly those carried out by regional actors, local authorities, associations, and local stakeholders who play a vital role in managing these health crises. The increase in the frequency and intensity of heat waves, linked to climate change, has been frequently documented worldwide and in France. In France, since 2015, heat wave alerts have affected more departments, some of which had never previously been placed under an orange heat wave alert. Temperature records have been broken, and heat waves occurring earlier (in June) or later (late August–early September) have been observed. Finally, for the first time since the implementation of the National Heat Wave Plan in 2004, red alerts were issued during the summer of 2019. For this year, despite a low level of confidence, Météo-France’s three-month forecast suggests that, across the southwestern two-thirds of France, the coming quarter is expected to be drier than normal. Regarding temperatures, no clear trend emerges for France except along the Mediterranean coast, which is expected to experience a warmer-than-normal quarter from July through September 2020 (3). During the circulation of the SARS-CoV-2 virus and in the event of heat waves, certain recommendations and measures related to heat waves and COVID-19 will need to be adapted to ensure optimal health protection for the entire population. This summary first reviews current prevention measures regarding heat waves and COVID-19, and then highlights key considerations regarding recommendations and measures within both prevention frameworks should a heat wave occur during the period of SARS-CoV-2 circulation.