Ocean Temperatures Hit Record Highs Conducted by several teams of scientists, the analysis of the world's oceans was published in journal 'Advances In Atmospheric Sciences.' It found that in the past five years, ocean temperatures have been the warmest ever recorded. 2019 "displayed the largest single-year [temperature] increase of the entire decade." Prof. John Abraham, via 'The Guardian' Warmer ocean temperatures lead to an increase in severe weather systems. This leads to more flooding, catastrophic fires and a rise in sea level. Prof. John Abraham, via 'The Guardian'