Air temperatures vary from island to island, and water temperatures can vary greatly since they are affected by converging currents and upwellings that create the rich seas that support so much life. For air temperature, in general, you’ll find that from January to May the lows are at 60-70°F and the highs 85-90°F. From June to December the lows are 65-70°F and the highs 75-90°F. The water temperatures from January to May are 75-82°F and from June to December are 62-68°F.