Sea temperatures Tonga Sea temperature Tonga Created with Highcharts 3.0.8Sea temperature828282828078777575777780JanFebMarAprMayJuneJulAugustSeptOctNovDec0 °20 °40 °60 °80 °100 ° Jan Feb March April May June Jul August sept. Oct nov. dec. Sea temperature82°82°82°82°80°78°77°75°75°77°77°80°