That makes for very stable and pleasant conditions. During the winter months the water does feel cooler because the air is cooler, however you can comfortably snorkel, snuba and dive year round in Maui. During the cooler months of December-May the average ocean temperatures range from 74-76 degrees F.
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Water Temperatures in MauiIn June and July, when temperatures are at their highest, the water is generally about 78°F/25°C, making it perfect or Molokini snorkeling. In August and September, when temperatures may slide back a few degrees, the water has gotten really warm and may be 80°F/26.6°C.
April - an excellent month, but avoid holidays when applicable. May - the best overall month for visitors, in our opinion. Great weather and reasonable rates. September - excellent month, great weather, perfect time for those seeking fewer visitors.
Second only to the south shore, west Maui has many of the best beaches for swimming, snorkeling, and just about anything else you could want. And the crown jewel among them has to be the three-mile stretch of white shore and shimmering blue water at Ka'anapali Beach.
Don't enter the water at dawn, dusk or night when sharks are most active and/or moving closer to shore to find food. Be aware that some shark species, like tiger sharks, are always active, no matter what time of day.
Beaches of MauiOn these world famous shores you'll find white or black sand beaches, renowned surfing and windsurfing spots as well as some of the best beaches in the world to simply swim, snorkel and sunbathe. Many are easily accessible beach parks with lifeguards, picnic facilities and restrooms.
That said, despite the small numbers and rarity of attacks, data also shows that Maui has a disproportionately higher number of shark incidents than any other island.
Don't swim/surf/dive near harbor entrances, river mouths and channels, especially after heavy rains. These types of waters are known to be frequented by sharks. Don't wear high-contrast swimwear or shiny jewelry. Sharks can see contrast well.
Kaihalulu Red Sand Beach located on Maui is known to have rough water and is reported to be one of a handful of red sand beaches around the world. Makena Beach in Maui has the nickname of “breakneck beach” because the surf breaks right on the shore, making it very dangerous to swim in.
Maui's leeward side inarguably presents the best beaches on the island—if by “best” you mean golden sand, perfectly-swimmable waters, outstanding snorkeling opportunities, lulling waves gentle enough for first-time surfers, and sunshine in spades.
There's plenty of gorgeous water to be found at Maui's beach parks, but the clearest is in Honolua Bay, especially during the summer. Honolua is Hawaiian for “two harbors,” and the bay was originally used to receive ships and unload supplies.