Sea temperatures Finland Sea temperature Helsinki Created with Highcharts 3.0.8Sea temperature333232323746535550443935JanFebMarAprMayJuneJulAugustSeptOctNovDec0 °10 °20 °30 °40 °50 °60 ° Jan Feb March April May June Jul August sept. Oct nov. dec. Sea temperature33°32°32°32°37°46°53°55°50°44°39°35°