UV Index
UV Index
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Today's UV index in Hagåtña, Guam 
will be up to 12.7, 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.
UV index at 12.7 in Hagåtña 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.
The UV index in Hagåtña, Guam is very high, often reaching extreme levels during peak sunlight hours. This is due to its tropical marine climate and location near the equator.
Hagåtña has two main seasons: dry from December to June, and wet from July to November. However, the city experiences warm temperatures year-round, with an average high of 86°F (30°C).
Compared to its region and neighboring countries, Hagåtña's weather is consistently warm and humid. While other Western Pacific islands may have cooler temperatures at higher elevations, Hagåtña is located on a coastal plain with little variation in temperature throughout the year.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Hagåtña. It's designed to provide you with a better understanding of the yearly weather and sun exposure.