Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Posto da Mata, Brazil, where the sun's rays can be intense due to its tropical climate. Knowing the UV levels not only helps in preventing sunburn, but also plays a vital role in maintaining overall skin health. With peak UV exposure occurring around midday, hitting levels as high as 8 at 11 AM, awareness and protection are key to enjoying the outdoors safely. As you explore this beautiful region, keeping an eye on the UV Index will empower you to make informed choices and shield yourself from harmful effects.
As the sun rises, the UV Index begins its ascent, starting at a mild 1 by 7:00 AM. By 8:00 AM, it nudges up to 2, but the real surge occurs around 9:00 AM, peaking at a notable 4. At 10:00 AM, the index climbs to 6, indicating moderate UV exposure, and by 11:00 AM, it reaches a maximum of 8, urging sun safety precautions. The index gradually declines in the afternoon, dipping to 7 at 12:00 PM and then tapering to 6 by 1:00 PM. As the day progresses, the UV levels drop significantly, settling at 4 by 2:00 PM, and further diminishing to 2 at 3:00 PM. By late afternoon, the index falls to 1 at both 4:00 PM and 5:00 PM, finally receding to 0 by 6:00 PM and beyond, marking a day where protection was most vital during midday hours.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 2 | low | 45 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 |
Throughout the year, the UV Index exhibits significant fluctuations, with the highest levels recorded during the winter months. January, February, and November stand out as high-risk months, each reaching a peak UV Index of 15, categorized as extreme, with a dangerously short burn time of just 10 minutes. Following closely, March and April also fall into the extreme category—albeit slightly lower, at 13 and 12 respectively. Visitors and residents should remain vigilant, especially from September to October, where the UV Index spikes again, reaching levels of 12 and 14. For safety, it's crucial to limit sun exposure and employ protective measures such as wearing sunscreen, hats, and sunglasses during these high-risk months, particularly during midday when the sun's rays are at their strongest. Overall, maintaining awareness of UV levels is essential for skin protection throughout the year.
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 |
| Posto da Mata | 15 | 15 | 13 | 12 | 9 | 8 | 8 | 10 | 12 | 14 | 15 | 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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |