Last updated: June 2, 2025
In Petropolis, Brazil, understanding the UV Index is essential for safeguarding your skin and overall health. With its tropical climate, the region often experiences significant sun exposure, leading to increased risks of sunburn and long-term skin damage. During peak hours, particularly between 10:00 AM and 2:00 PM, UV levels can reach a maximum of 6, indicating a need for effective protective measures. By staying informed about the UV Index, locals and visitors can enjoy the beautiful outdoors of Petropolis while minimizing their risk of UV-related health issues. Whether it’s applying sunscreen or seeking shade, knowledge is your best defense against harmful UV radiation.
The UV Index throughout the day presents a dynamic picture of sun exposure. Early hours from 07:00 to 08:00 are marked by a low index of 1, making sun protection minimal. However, as the day unfolds, the intensity rises sharply; by 09:00, it reaches 3, climbing to a peak of 6 at both 11:00 and 12:00. During this time, it's crucial to take precautions against harmful rays. As the afternoon progresses, the UV Index gradually declines, dropping to 5 at 13:00 and further to 4 by 14:00. By late afternoon, the levels fall to 2 at 15:00 and drop to 1 by 16:00, and the sun's strength wanes completely after 18:00, where it dips to 0. Plan your outdoor activities wisely!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 5 | moderate | 30 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, UV Index levels exhibit significant seasonal variations, with extreme levels predominantly occurring from January to April and again in September to November. High-risk months include January to April and September to November, where the UV Index consistently reaches extreme levels (10 or above) with burn times as short as 10 minutes. In contrast, May to August shows a decrease in UV intensity, although May and August still classify as very high with burn times of 15 minutes. To ensure safety, it is crucial for both visitors and residents to take precautions during peak UV months by wearing suitable sun protection like sunscreen, hats, and sunglasses, particularly during midday hours when UV exposure is at its highest.
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 |
| Petropolis | 16 | 15 | 13 | 11 | 8 | 6 | 7 | 9 | 12 | 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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |