Last updated: May 3, 2025
In Iacu, Brazil, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. The intensity of ultraviolet rays can vary significantly throughout the day, peaking at a high UV Index of 11 from 11:00 AM to 12:00 PM, signaling dangerous levels of exposure that can lead to serious skin damage. Understanding these fluctuations is essential, especially in Iacu's tropical climate, where long periods of sunshine are common. By keeping an eye on the UV Index, residents and visitors alike can protect themselves from harmful UV radiation and enjoy the outdoors safely.
As the sun rises, the UV Index climbs steadily, starting at a gentle 1 at 7:00 AM. By 8:00 AM, it reaches 3, marking the beginning of increased sun exposure. The day continues to heat up, with the index peaking at a remarkable 11 from 11:00 AM to 12:00 PM, indicating a high risk for harm from unprotected sun exposure. As the afternoon sets in, it gradually declines, dropping to 6 by 2:00 PM and subsequently to 3 by 3:00 PM. As the sun begins to descend, the index returns to a safer 1 by 4:00 PM and tapers off to 0 after 6:00 PM. This hourly trend underscores the importance of sun protection during the midday hours when the UV exposure is at its highest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 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 |