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UV Index in Honolulu

UV index


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Today's UV index in Honolulu, United States United States will be up to 11.8, indicating a extreme 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.


Today's tips

UV index at 11.8 in Honolulu means extreme risk; limit outdoor time from 10 a.m. to 4 p.m., use shade, protective clothing, SPF 30+ sunscreen, and sunglasses; watch for bright surfaces like water and snow increasing UV exposure.

Honolulu's UV Index

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.

Weather Seasons

UV index

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.

Honolulu's Climate

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.

Annual Sun Radiation

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.


* This page's content about the UV index in Honolulu (United States) is for educational and informational purposes only. The developers and data providers are not liable for the accuracy, reliability, or availability of the information. The information is not a substitute for professional medical advice, and the developers and data providers are not medical professionals. Seek advice from a qualified health provider for any medical concerns, and do not disregard medical advice or delay seeking it based on the information provided on this site.