Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Alta Floresta, Brazil, where the combination of a tropical climate and high UV exposure poses significant risks to skin health. With peak UV levels reaching an extreme 11 around midday, awareness of these fluctuations can help prevent painful sunburns and long-term skin damage. By keeping an eye on the daily UV index and adopting protective measures, you can enjoy the vibrant outdoors while safeguarding your skin against harmful radiation. Remember, in a region blessed with abundant sunshine, knowledge and caution are your best allies!
At 07:00, the UV Index starts low at 1, gradually climbing to 3 by 08:00. As the sun rises higher, the intensity surges, peaking at a striking 11 by 11:00 and remaining at that level until 12:00. The afternoon sees a slight decrease, with the index slipping to 10 by 13:00 and then further to 7 at 14:00. By mid-afternoon, the UV Index does a dramatic drop to 4 at 15:00, and by 16:00, it falls back to 1. The sun begins to set, leading to a complete reduction, bringing UV levels down to 0 by 19:00. This data illustrates a typical day of high UV exposure during the midday hours, highlighting the importance of sun protection at peak times.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | 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 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 |