UV Index
UV Index
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Today's UV index in San Juan, Puerto Rico 
will be up to 11.9, 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 11.9 in San Juan 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 San Juan, Puerto Rico, is typically high due to its tropical location. On average, the UV index stays above 9 for 7 months of the year, and above 11 for 3 months.
San Juan experiences two main seasons: the dry season from December to April and the wet season from May to November. The city has an average temperature of 82°F (28°C) year-round, with minimal temperature variation.
Compared to its region and neighboring countries, San Juan is warmer and more humid than many other Caribbean cities, with less temperature variation throughout the year due to its coastal position and tropical climate.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in San Juan. It's designed to provide you with a better understanding of the yearly weather and sun exposure.