Best diving season in the isles of Milan. It is open to tourists from October to the end of April of the following year, and the air temperature range is 30-35 ° C / 85-95 ° F. The sea water temperature range is 28-30 ° C / 82.4-85 ° F, suitable for medium diving. Scuba diving is banned in the Spratly Islands from May to October in order to breed underwater creatures.