Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Alta Floresta, Brazil, as it serves as a vital indicator of sun exposure levels. With the potential for high UV levels, especially during midday hours when the index peaks at 10, being aware of these measurements can significantly aid in preventing sunburn and maintaining long-term skin health. Situated in a tropical climate zone, Alta Floresta experiences intense sunlight and varying UV risks throughout the day, making it essential to take precautions and protect your skin, particularly between 10 AM and 2 PM when UV radiation is at its most potent. Stay informed and enjoy the sun safely!
From sunrise to sunset, the UV Index tells a compelling story of the day's sun. Starting at a gentle 1 at 07:00, the UV levels gradually rise, peaking at an intense 10 by 11:00 and 12:00. This signifies a critical window for sun safety, as exposure during these hours demands caution. Just after noon, the index begins to decline, slipping to 9 at 13:00 and further down to 6 by 14:00. As the evening approaches, the numbers diminish swiftly to 4 at 15:00, and finally taper off to a relaxing 1 by 17:00, with complete relief from UV exposure by 19:00 when it hits 0. It's clear that being sun-smart is essential especially during the midday peak!
| 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 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | 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 in this region remains notably high, with January to April experiencing extreme levels (UV Index 16-15) and a consistent burn time of just 10 minutes. The summer months of June and July see a slight reduction to a very high UV Index of 10, extending the burn time to 15 minutes; however, August escalates back to extreme levels with a UV Index of 11. September to November then return to extreme values, maintaining a burn time of 10 minutes. December holds steady with a UV Index of 15. Given this data, both visitors and residents should take precautionary measures year-round, particularly during the high-risk months of January through April and the transitional months of August and September, by wearing protective clothing, using sunscreen, and minimizing sun exposure during peak hours.
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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |
| Alta Floresta | 16 | 16 | 16 | 15 | 12 | 10 | 10 | 11 | 12 | 13 | 15 | 15 |