Summer in the islands is characterized by warmer temperatures ranging from 75 – 85 Fahrenheit, a fairly dry climate, and a calmer ocean. Winter in Hawaii is cooler (65 – 75°), wetter, and has a larger, rougher surf.
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The yearly low average?70 degrees. The overall average temperature is 77 degrees. This is a big part of what has made Hawaii the world's most iconic tropical vacation destination for generations.
It does not have the extremes of cold winters and summer heat waves and it usually does not have hurricanes and hailstorms. However, Hawaii's tallest peaks do get their share of winter blizzards, ice, and snow. Highest temperatures may reach into the 90s.
Additionally, August and September are Hawaii's warmest months, with August being the hottest month overall. You can expect the average high temperature to reach around 87 degrees daily, while the average low temperature tends to stay around 76 degrees in August.
The weather in Hawaii and Mexico are gorgeous. Mexico may get unbearably hot sometimes in summer. The temperature does not shoot up more than 90 degrees Fahrenheit in Hawaii. Weather in Hawaii is more pleasant than Mexico although it is not very hot in Mexico.
Hawaii is blessed with sunshine virtually all year-round, so any time would be a great time for a visit. Temperature changes are minor: During the summer, the average daytime temperature is 85°; in the winter, it's 78°. Even near-shore ocean temperatures don't vary that much, averaging 74° throughout the year.
Yes, 75 and cloudy is quite comfortable for swimming as well as many other activities. Ideally the water will be a similar temperature or slightly warmer. If it is particularly cold just be sure not to stay in too long.
If you go to the higher elevations on Maui and the Big Island, be prepared for cold temperatures. Temperatures above 10,000 feet will only reach the 40s to near 50 during the day and drop into the 20s at night. At elevations above 12,000 feet it is still possible for snow to occur, even into early May.
Maui, Florida, and Southern California are all known for their balmy surf and fabulous beaches. But not all warm water is created equal. With temperatures that summer between 75 and 80 degrees all year, Maui is by far the most reliable place in the U.S. to dive, dunk, swim, and snorkel in comfort.