UV Index
UV Index
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Today's UV index in San José, Costa Rica 
will be up to 12.4, indicating extreme risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
UV index at 12.4 in San José 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.
Read more here about the climate and sun exposure in and around San José.
The UV index in San José, Costa Rica, is generally high throughout the year, with an average of 10 (extreme) during the peak summer months and around 6-7 (high) during the rest of the year. It is important to protect your skin by using sunscreen, wearing hats, and seeking shade, especially during the hottest hours of the day between 10 am and 4 pm.
San José has a tropical climate with two main seasons: the dry season and the rainy season. The dry season lasts from December to April and is characterized by warm temperatures, with average highs around 29 °C (84 °F) and lows around 18 °C (64 °F). The rainy season, from May to November, brings more precipitation and slightly cooler temperatures, with average highs around 26 °C (79 °F) and lows around 17 °C (63 °F).
Compared to other regions in Costa Rica, San José receives less sunshine due to its higher elevation. However, it still experiences a considerable amount of sun exposure, especially during the dry season when the days are generally sunny. It is important to take sun protection measures, even during the rainy season, as UV rays can still penetrate through clouds and cause harm to the skin.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in San José. It's designed to provide you with a better understanding of the yearly weather and sun exposure.