Last updated: May 3, 2025
In Biguacu, Brazil, understanding the UV Index is crucial for safeguarding your skin in the face of its subtropical climate. The UV Index measures the strength of ultraviolet radiation from the sun, ranging from low to high levels throughout the day. Awareness of these levels is essential for sunburn prevention and promoting long-term skin health. With peak UV Index values reaching 6 around midday, residents and visitors must take precautions against potential harm during these hours. By keeping an eye on the UV Index, you can enjoy all that Biguacu's beautiful outdoor environment has to offer while minimizing your risk of sun-related damage.
The UV Index for the day shows a notable increase in solar intensity as the morning unfolds. Starting at a mild 1 between 07:00 and 09:00, the index rises sharply, peaking at 6 from 11:00 to 13:00. This is a clear indication that midday sun demands caution, with later hours dropping to 5 at 14:00 and gradually decreasing toward evening. By 18:00 and 19:00, the UV Index dips to 0, signaling a safe time to be outdoors without sun protection. Overall, this day encourages sun safety practices during those peak hours when the UV rays are most potent.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 5 | 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 |
Seasonal UV changes indicate that January through March experience extremely high UV levels, peaking with an UV Index of 15, which results in a very short burn time of just 10 minutes. April marks a shift to a very high category with an Index of 10 and a burn time of 15 minutes, while May sees a decrease to high levels (UV Index 7). The summer months of June and July maintain a moderate UV Index of 5, allowing for longer safe exposure times of 30 minutes. As August and September approach, UV levels rise again to very high (UV Index 8 and 10, respectively), leading to shorter burn times. The fall months of October and November return to extreme levels, each with an UV Index of 13 and 14, necessitating a burn time of only 10 minutes. Finally, December reverts to extreme conditions. Visitors and residents should be especially cautious during the extreme months (January, February, March, October, November, December) and ensure adequate sunscreen protection and limited exposure during peak UV times to avoid sunburn.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biguacu | 15 | 14 | 12 | 10 | 7 | 5 | 5 | 8 | 10 | 13 | 14 | 15 |
| 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 |