UV Index
UV Index
Today's UV index in San Juan, Puerto Rico 
will be up to 11.1, 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: 2025-07-21
UV index at 11.1 in San Juan 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 San Juan, Puerto Rico, is usually high, often ranging from 7 to 11 during midday. This means the sun's rays are very strong, especially in the summer months.
San Juan has a tropical climate with warm temperatures all year round. The rainy season is from April to November, and the dry season is from December to March. It rarely gets too cold or too hot.
Compared to nearby Caribbean islands, San Juan's weather is fairly typical with warm temperatures and a wet season. It is generally sunnier and less rainy than places like Jamaica or the Dominican Republic.
See the UV index hour by hour for San Juan, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.