UV Index
UV Index
Today's UV index in Honolulu, United States 
will be up to 11.4, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-20
UV index at 11.4 in Honolulu means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
Honolulu's UV index is usually high, especially in summer, often ranging from 7 to 11, which means strong sunlight. The UV intensity is generally lower in winter but still significant throughout the year.
Honolulu experiences warm weather year-round with mild changes between seasons. Summers are hot and humid, while winters are cooler but still pleasant, with temperatures rarely dropping below 65°F (18°C). Rainfall is more common in winter.
Compared to the mainland U.S., Honolulu is much warmer and more stable throughout the year. It is sunnier and less rainy than many Pacific islands. Nearby places like Maui or Kauai have similar tropical weather but can be wetter in some areas.
See the UV index hour by hour for Honolulu, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.