Rising tide

The timing of the record is particularly notable. Global ocean temperatures are typically highest in March and April, following the austral summer, yet this record has been reached in August. It also exceeds the previous highest August value, recorded in 2023 at 20.98°C. This latest daily record follows a succession of monthly sea surface temperature records and near-records observed throughout 2026 across the extra-polar ocean (60°S to 60°N), underscoring the persistent warmth seen across much of the global ocean. Copernicus