Year-Round Humidity: Honolulu has a relatively consistent humidity level throughout the year, typically ranging from 60% to 80%. This means that the air is often moist and can feel humid, especially during warmer months.
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Hawaii is well known for having high levels of humidity across all of the islands. The levels can vary widely depending on the time of day, elevation, and the season. For example, the humidity can sit anywhere between 50%-90%. That's pretty steamy!
Humidity in Hawaii is often relatively high—an unavoidable reality for islanders in such a hot climate. Humidity is caused by excess water vapor in the air. And, being surrounded by the Pacific Ocean on all sides, humidity in Hawaii will always be higher than in most places.
One of the reason for the hot days is our warm waters. The ocean around Hawaii has also been slightly higher than normal. That in turn can heat up daytime temperatures even more.
Hawaii's warmest months are not June and July, but August and September. Its coolest months, are not December and January, but February and March, reflecting the seasonal lag in the oceans's temperature.
In Hawai'i, average temperatures could increase by as much as 2.7 degrees Fahrenheit in 2024, and up to 7.2° F at sea level by the end of the century. We can expect this to severely affect our communities, ecosystems, and economy.
Culex quinquefasciatus is found on all islands and is the most common nigh-biting mosquito in Hawaii. The immature stages of all mosquitoes occur in water; only the adult mosquito lives out of water. Up to 250 are laid singly or in clusters, depending on the species.
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.
Hawaii's trade winds bring a constant flow of fresh temperate air traveling for thousands of miles over tropical ocean waters, naturally cooling the islands and providing the cleanest air anywhere on the planet.