World’s oceans hit hottest temperature on record in August

Average sea surface temperature outside polar regions was 21.1C on Saturday, latest data finds The world’s oceans were hotter than ever previously recorded on Saturday, according to the latest data. The average surface temperature was 21.1C, with the rising marine heat a stark indicator of the climate crisis. More than 90% of the heat trapped by carbon dioxide from fossil fuel burning enters the oceans. The Guardian’s climate forum 2026 On Tuesday 20 October, join Damian Carrington, and our…