Last updated: July 2, 2025
In Guaratuba, Brazil, awareness of the UV Index is crucial for protecting your skin and overall health. With tropical weather characterized by high sun exposure, understanding UV levels helps to prevent sunburn and long-term skin damage. During peak hours, particularly between 10 AM and 2 PM, UV Index values can reach as high as 6, indicating a significant risk for harm without proper sun protection. Stay informed and safe while enjoying the beautiful beaches and vibrant scenery of Guaratuba, where the sun shines bright and the risk of UV exposure is a daily reality.
The UV Index throughout the day showcases a clear progression of sun intensity. Starting at a mellow 1 at 07:00 and 08:00, the index gradually climbs, reaching its peak of 6 by 12:00. For those looking to soak up the sun, the 11:00 to 12:00 window offers the most potent rays at a level of 5 and 6, respectively. As afternoon sets in, the index begins to wane, dropping to 4 at 14:00, then 3 at 15:00, and tapering off to 1 by 16:00. By 18:00 and 19:00, the UV exposure diminishes to 0, signaling a safe time to enjoy outdoor activities without sun protection. Plan your sun time wisely to stay safe and make the most of each hour!
| 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 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 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 |
The seasonal UV changes indicate that January to March experiences extremely high UV Index levels, with values peaking at 15 in January and February, necessitating a burn time of just 10 minutes. As spring approaches, the UV Index begins to moderate, reaching 7 in May and 6 in June and July, where the burn time extends to 25 minutes. However, UV levels rise again in late summer and fall, particularly in August and September, both classified as very high, with a significant decrease in burn time to 15 minutes. The high-risk months are therefore noted as January through March and October through November, where extreme levels demand heightened caution. Visitors and residents should be advised to prioritize sun safety practices throughout these months, utilizing broad-spectrum sunscreen, wearing protective clothing, and seeking shade during peak sun hours to minimize the risk of UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Guaratuba | 15 | 14 | 12 | 10 | 7 | 6 | 6 | 8 | 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 |