UV Index in San Jose, Puerto Rico

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of San Jose, Puerto Rico, where the tropical climate brings with it intensified sun exposure. This index provides valuable insights into harmful UV radiation levels, helping you take proactive measures against sunburn and long-term skin damage. With peak UV levels soaring to 13 around noon, it's essential to stay informed about the daily fluctuations. As daylight stretches across the tropical skies, knowing when to seek shade or apply sunscreen can make all the difference in maintaining healthy skin while enjoying the sun-drenched beauty of San Jose.

Hourly UV Index in San Jose

The UV Index begins at a mild level of 1 at 07:00, but as the sun climbs higher, it swiftly escalates. By 10:00, it peaks at a critical 9, reaching a maximum of 13 at 12:00, indicating that protective measures are essential. After noon, the index gradually declines, tapering to 7 by 15:00, before dipping to a 2 by 17:00, and finally settling at 0 by 19:00 as the sun sets. This data highlights the importance of sun safety during the hours when UV exposure is at its highest, particularly around midday.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:003moderate30 min
09:005moderate30 min
10:009very high15 min
11:0011extreme10 min
12:0013extreme10 min
13:0012extreme10 min
14:0010very high15 min
15:007high25 min
16:004moderate30 min
17:002low45 min
18:001low45 min
19:000low45 min

Monthly UV Index Trends in San Jose

Throughout the year, UV Index levels vary significantly, with the highest readings occurring from February to October. During this period, the UV Index remains predominantly in the extreme category, peaking at 14 in May and remaining consistently high at 13 from June to September. The months at highest risk for UV exposure are February to October, where the burn time is reduced to just 10 minutes. January, November, and December see a slight decrease in risk, with UV Index levels categorized as very high and a longer burn time of 15 minutes. Visitors and residents are advised to take extra precautions during these peak months by wearing protective clothing, applying broad-spectrum sunscreen frequently, and seeking shade during peak hours to minimize skin damage.

Monthly Maximum UV Index for San Jose, Puerto Rico

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in San Jose. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec911131414131313131298
Data source: Statistical UV Index data for San Jose, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare San Jose UV Index with Other Puerto Rico Cities

The table above highlights how UV exposure in San Jose compares to other major locations across Puerto Rico. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
San Jose's solar exposure compared to other cities in Puerto Rico. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Caguas UVI911131314131213131298
Carolina UVI911131314131213131298
San Juan UVI911131314131213131298
San Jose911131314131313131298
Bayamon UVI911131314131313131298
Ponce UVI9111314141313131412109