Last updated: July 2, 2025
In Iacu, Brazil, being aware of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding the UV levels throughout the day helps residents and visitors protect themselves from harmful rays, which can lead to both immediate discomfort and long-term skin damage. Iacu's tropical climate, characterized by high temperatures and sunny days, often results in elevated UV exposure—especially between 10:00 AM and 2:00 PM, when the index peaks at a high 10. By staying informed about the UV Index, you can enjoy the sun safely while minimizing the risks associated with excessive exposure.
Throughout the day, the UV Index exhibits a distinct peak just before noon. Starting off at a mild 1 at 7:00 AM, it rises steadily, reaching 2 by 8:00 AM. By 9:00 AM, it jumps to 5, and then it surges to an impressive 10 at both 11:00 AM and 12:00 PM, indicating a high level of sun exposure risk. As the afternoon unfolds, the readings dip to 9 at 1:00 PM and subsequently decline further to 6 at 2:00 PM. By 3:00 PM, it drops to 3, and the day winds down with values of 1 at 4:00 and 5:00 PM, before fading to 0 by 6:00 PM and beyond. For optimal sun safety, keep to the shade as the sun peaks!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index in this region demonstrates significant fluctuations throughout the year, with the highest readings occurring in the winter months of January to April, where levels reach 15 and are classified as extreme, resulting in a mere 10 minutes burn time. As spring transitions into summer, the index begins to decline slightly, hitting a low of 9 in June, before peaking again at 12 in August. Following summer, the index shows another increase in September and October, returning to extreme levels of 15 for November and 14 for December. High-risk months are predominantly from January to April and in August, as well as October to November, where vigilance is required for sun exposure. It is advisable for visitors and residents to take precautionary measures such as applying sunscreen, wearing protective clothing, and seeking shade during peak hours to mitigate the risks associated with high UV levels.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rio de Janeiro UVI | 15 | 14 | 13 | 10 | 7 | 6 | 7 | 9 | 11 | 12 | 13 | 15 |
| Sao Paulo UVI | 16 | 15 | 12 | 11 | 8 | 6 | 7 | 9 | 11 | 13 | 14 | 15 |
| Belo Horizonte UVI | 17 | 16 | 14 | 12 | 9 | 7 | 8 | 10 | 12 | 13 | 14 | 16 |
| Salvador UVI | 14 | 14 | 14 | 13 | 10 | 9 | 9 | 12 | 12 | 15 | 15 | 14 |
| Iacu | 15 | 15 | 14 | 13 | 11 | 9 | 10 | 12 | 13 | 15 | 15 | 14 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |