Sea temperatures Saint Martin Sea temperature Simson Bay Lagoon Created with Highcharts 3.0.8Sea temperature787878808282848484848480JanFebMarAprMayJuneJulAugustSeptOctNovDec0 °20 °40 °60 °80 °100 ° Jan Feb March April May June Jul August sept. Oct nov. dec. Sea temperature78°78°78°80°82°82°84°84°84°84°84°80°