The Average Water Temperatures in Kona, HI

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The Ironman World Championships are held in Kona on the Big Island of Hawaii every October. Athletes from around the world who've qualified for the event gather to swim, bike and run this iconic course. The swim held in Kailua Bay features a mass start, with more than 2,000 triathletes converging at once. These athletes aren't typically wearing wetsuits, as the water temperature usually hovers around 79 degrees Fahrenheit. Ironman rules stipulate that wetsuits may only be worn when the water temperature is 76.1 F and below.

Seasonal Temperatures

  • The water temperature off the big island's coast doesn't change that much, even during the colder months of January, February and March. The lowest average temperatures are about 77 F while the water can reach 80 to 81 F, on average in August and September.

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