Last updated: June 2, 2025
In the picturesque town of Mata de São João, Brazil, being aware of the UV Index is crucial for maintaining skin health and preventing sunburns. Understanding the daily UV levels helps residents and visitors make informed decisions about sun protection, especially during peak hours when the risk is highest. With a tropical climate and dramatic fluctuations in UV exposure—peaking at 9 between 11:00 AM and 12:00 PM—it's essential to embrace sun safety measures. By being mindful of the UV Index, you can enjoy the stunning beauty of Mata de São João while protecting your skin from potential damage.
The UV Index on this particular day presents a clear pattern of sun exposure. Starting at a mild level of 1 at 07:00, the intensity rises gradually, peaking at 9 between 11:00 and 12:00, indicating a high risk for skin damage without appropriate protection. As the afternoon progresses, the index begins to decline, dropping to 5 by 14:00 and swiftly decreasing to 1 by 16:00. After 17:00, the UV Index falls to 0, signaling a safe end to sun exposure for the day. For those planning outdoor activities, it’s essential to maximize protection during the peak hours when the index soars to its highest levels!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 5 | moderate | 30 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 experiences extreme levels throughout most of the year, with particularly high-risk months occurring from January to April, where the Index consistently reaches 14, requiring just 10 minutes of exposure before burning occurs. Although there is a slight reduction in June and July with a UV Index of 9 and 10, respectively, the risk remains very high, with a burn time of 15 minutes. From August to November, the UV Index rises again, reaching levels of 12 to 15, and maintaining a burn time of 10 minutes in most cases. Given these seasonal fluctuations, it is crucial for both visitors and residents to take protective measures such as applying sunscreen, wearing protective clothing, and seeking shade during peak hours to minimize skin damage from UV exposure.
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 |
| Mata de Sao Joao | 14 | 14 | 14 | 13 | 11 | 9 | 10 | 12 | 12 | 14 | 15 | 14 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |