Good to marginal diving visibilities with poor conditions where waves are breaking. Water temperatures at Kihei, Ma'alaea, and La Perouse will be near 77F degrees. Diving conditions will be good, turning marginal to poor where waves are breaking. The waters around the island of Maui can usually be expected to have excellent visibilities, but a number of factors can prevent those clear water conditions that people from all over the world travel to Hawaii to get. Typically, viewing distances can be expected to be in the 30-50 foot range, with even higher clarity at times in the near shore dive spots.
Waves are the most common agent of cloudy water conditions.
Turbulence from strong surface winds can also cause less then perfect conditions as well. Another source of cloudy conditions are surface water runoff from heavy precipitation which ends up in the ocean - Mud and soil are carried into the water as streams or runoff enter the ocean. This very informative link gives vital information about the Ocean surrounding Hawaii.