Last updated: June 2, 2025
In Tres de Maio, Brazil, staying informed about the UV Index is crucial for protecting your skin from harmful ultraviolet rays. Understanding UV levels is key to preventing sunburn and long-term skin damage, especially in a region where the climate is characterized by warm summers and moderate rainfall. With peak UV levels reaching 5 around midday, residents and visitors alike should take note of these fluctuations to ensure their outdoor activities remain safe and enjoyable. By being UV-aware, you not only safeguard your skin health but also enhance your overall well-being in the beautiful Brazilian sun.
The UV Index data reveals a dynamic progression throughout the day. Starting at 0 at 7:00 AM, the intensity begins to rise slowly, reaching 1 by 8:00 AM and 9:00 AM. By 10:00 AM, it escalates to 3, indicating a moderate level of UV exposure. 11:00 AM sees the index peak at 4, and the sun reaches its zenith by noon with a UV Index of 5, marking a high risk level. The afternoon maintains this peak at 5 until 1:00 PM, before gradually declining to 4 at 2:00 PM and further down to 3 by 3:00 PM. As the sun sets, the UV radiation drops sharply, returning to 1 at 4:00 PM and 5:00 PM, and finally back to 0 from 6:00 PM onward. Awareness of these fluctuations can guide outdoor plans, ensuring protection during the peak UV hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 3 | moderate | 30 min |
| 11:00 | 4 | moderate | 30 min |
| 12:00 | 5 | moderate | 30 min |
| 13:00 | 5 | moderate | 30 min |
| 14:00 | 4 | 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 |
Throughout the year, the UV Index experiences significant seasonal variations, with highest levels occurring from January to March, where it reaches an extreme index of 15 to 12 and a burn time as low as 10 minutes. This trend continues with high-risk months in October and November that again escalate to index levels of 14. During the spring and summer months, the index decreases slightly: in April, it drops to 10, and by May, it sits at 6. While summer sees lower levels, July and August maintain a high exposure category of 6 to 7, with longer burn times of 25-30 minutes. Visitors and residents should take extra precautions during the extreme months—particularly from January to March and in late October to November—by wearing protective clothing, applying sunscreen, and seeking shade to minimize harmful UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tres de Maio | 15 | 14 | 12 | 10 | 6 | 5 | 6 | 7 | 10 | 13 | 14 | 14 |
| 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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |