With San Juan's UV index reaching 7.6, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours between 10 a.m. and 4 p.m., when UV rays are strongest.
Read more here about the climate and sun exposure in and around San Juan.
The UV index in San Juan, Puerto Rico can often be high, especially during the summer months. It is not uncommon for the UV index to reach levels of 10 or higher (which is considered very high). This means that the sun's rays can be extremely intense, and it is important to take precautions such as wearing sunscreen, hats, and sunglasses to protect your skin and eyes.
San Juan experiences two main weather seasons: the dry season and the rainy season. The dry season, which runs from December to April, is characterized by lower levels of rainfall and slightly cooler temperatures. On the other hand, the rainy season, which spans from May to November, brings more frequent rainfall and higher humidity. During this period, temperatures can be quite warm and reach into the high 80s °F (around 30-32 °C), making it a popular time for beach activities.
Compared to other cities in the Caribbean region, San Juan enjoys ample sunshine throughout the year. With an average of around 2,870 hours of sunshine annually, it is more exposed to the sun compared to destinations like Nassau, Bahamas, and Havana, Cuba. However, it is important to note that the high UV index in San Juan highlights the need for sun protection to avoid sunburn and other harmful effects of prolonged sun exposure.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in San Juan. It's designed to provide you with a better understanding of the yearly weather and sun exposure.