UV Index
UV Index
Today's UV index in Hagåtña, Guam 
will be up to 11.9, 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: 2025-05-10
UV index at 11.9 in Hagåtña 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.
The UV index in Hagåtña, Guam, is usually very high year-round, often ranging from 8 to 11, meaning the sun’s rays are strong and can cause sunburn quickly.
Hagåtña has a tropical climate with little temperature change throughout the year. It has a wet season from July to November and a dry season from December to June. Rainfall is heavier during the wet season.
Compared to nearby islands, Guam’s weather is warmer and more humid than places like the Philippines or Japan. It is wetter than some Pacific islands but less windy than others during typhoon season.
See the UV index hour by hour for Hagåtña, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.