UV Index in Cayey, Puerto Rico

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Cayey, Puerto Rico, where the sun shines brightly nearly all year long. Keeping an eye on UV levels helps in preventing sunburn and protecting long-term skin health, especially during the peak hours when the index can reach a dazzling 13 around noon. With a climate characterized by warm temperatures and ample sunshine, it’s essential to be aware of the risks associated with high UV exposure, making smart choices about sun protection while enjoying the beautiful outdoors. Stay informed and protect your skin while soaking up the vibrant beauty of Cayey!

Hourly UV Index in Cayey

As the sun rises, the UV Index starts modestly at 1 at 07:00, indicating minimal risk. By 09:00, it climbs to a moderate 5, encouraging outdoor enthusiasts to take precautions. The peak emerges around 12:00, hitting a noticeably high 13, and remains intense until 14:00 when it slightly dips to 11. As the afternoon wanes, the index gradually decreases; by 15:00, it falls to 7, and as evening approaches, it continues its decline to 2 at 17:00. Finally, the UV Index settles at 1 by 18:00, ultimately dipping to a safe 0 by 19:00. It's a day where midday sun protection is paramount!

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
08:002low45 min
09:005moderate30 min
10:008very high15 min
11:0011extreme10 min
12:0013extreme10 min
13:0013extreme10 min
14:0011extreme10 min
15:007high25 min
16:004moderate30 min
17:002low45 min
18:001low45 min
19:000low45 min

Monthly UV Index Trends in Cayey

The UV Index exhibits significant seasonal changes, with the highest readings occurring from February to October, where exposure levels reach an extreme category and burn times are dangerously short at 10 minutes. March through September are particularly high-risk months, peaking in April and May with a UV Index of 14. Residents and visitors should be extremely cautious during these months, ensuring proper sun protection such as wearing sunscreen, protective clothing, and sunglasses. In contrast, November and December are notable for their relatively lower UV levels classified as very high, albeit still requiring sun safety measures, with burn times lengthening to 15 minutes. It is advisable for everyone to monitor the UV Index regularly and adopt appropriate precautions year-round to minimize the risk of sunburn and long-term skin damage.

Monthly Maximum UV Index for Cayey, Puerto Rico

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Cayey. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec911131414131313141299
Data source: Statistical UV Index data for Cayey, 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 Cayey UV Index with Other Puerto Rico Cities

The table above highlights how UV exposure in Cayey 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.
Cayey'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
Bayamon UVI911131314131313131298
Cayey9111314141313131412109
Ponce UVI9111314141313131412109