Warmest August Waters on Record 2 (IMAGE) Arizona State University Caption The black line shows the rise in 2019 ocean temperatures, making the hottest ocean temperature ever recorded in August, and the next 4-8 weeks warming a great threat to Hawaii's coral reefs. Credit NOAA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.