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So overall, compared to those warm water areas of the U.S. Gulf and Florida, Hawaiian waters are warmer in the winter and cooler in the summer. As a general rule, Hawaiian waters average 77 degrees in the wintertime to 82 degrees in the summertime.
The temperatures in Hawaii Volcanoes National Park only range about 10 degrees from summer to winter, but the winters are cooler and rainier than the summers at the park. On average, the warmest month of the year is August, and the coolest is February. The average temperature on the coasts is about a high of 83 degrees, and a low of 68 degrees. Temperatures also vary as altitude increases. For example, it is 12-15 degrees cooler on the top of Kilauea, than the rest of the park.