Sea temperatures Cook Islands Sea temperature Cook Islands Created with Highcharts 3.0.8Sea temperature828282827877777777777880JanFebMarAprMayJuneJulAugustSeptOctNovDec0 °20 °40 °60 °80 °100 ° Jan Feb March April May June Jul August sept. Oct nov. dec. Sea temperature82°82°82°82°78°77°77°77°77°77°78°80°