UV Index
UV Index
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Today's UV index in Honolulu, United States 
will be up to 10.9, indicating a very high level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index of 10.9 in Honolulu, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
The UV index in Honolulu, United States, is often high due to its tropical location near the equator. On average, the UV index is high to very high from April to September and moderate to high during the rest of the year.
Honolulu has two main seasons: summer, which lasts from May to October, and winter, which lasts from November to April. Summer temperatures range from 75°F to 88°F (24°C to 31°C) while winter temperatures range from 68°F to 80°F (20°C to 27°C). Rainfall is more frequent in winter, but it rarely snows in the city.
Compared to its region and neighboring countries, Honolulu's weather is relatively mild and stable. While mainland United States experiences significant temperature fluctuations and snow in winter, Honolulu enjoys warm temperatures year-round. Similarly, its neighbors in the Pacific, such as Australia and New Zealand, have distinct seasonal variations, with cooler winters and hotter summers.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Honolulu. It's designed to provide you with a better understanding of the yearly weather and sun exposure.