Last updated: July 2, 2025
In Rio das Ostras, Brazil, understanding the UV Index is crucial for protecting your skin and overall health. With a tropical climate that often brings high sun exposure, residents and visitors need to be aware of UV levels to prevent sunburn and long-term skin damage. The UV Index typically peaks around noon, reaching levels of 7, which indicates a high risk of harm from unprotected sun exposure. By staying informed about the UV Index, you can enjoy the beautiful beaches and outdoor activities of Rio das Ostras while safeguarding your skin against the sun's harmful rays.
The UV Index today began its ascent at 7:00 AM with a modest 1, slowly climbing to 2 by 8:00 AM. As the sun rose higher, the index reached 3 at 9:00 AM, then jumped to 5 by 10:00 AM. The peak was recorded at 11:00 AM and 12:00 PM, both hitting a notable 7. By 1:00 PM, the UV Index slightly dipped to 6, followed by a gradual decline to 5 by 2:00 PM. This downward trend continued as it fell to 3 at 3:00 PM and further decreased to 1 by 4:00 PM. The day wrapped up with very low readings of 1 at 5:00 PM, and dropping to 0 by 6:00 PM, indicating a safe evening with minimal UV exposure. Make the most of the sun wisely! ☀️
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 7 | 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 |
Throughout the year, seasonal UV changes exhibit significant fluctuations, particularly peaking during the winter months (January to April) with an extreme UV Index ranging from 11 to 16 and a burn time of just 10 minutes. The high-risk months are notably concentrated in the winter and early spring, where the UV Index remains extreme, suggesting that visitors and residents should take extra precautions by seeking shade and wearing protective clothing. As we transition into late spring and summer, the UV Index decreases to a very high and high level, allowing for slightly longer safe exposure times of 15 to 25 minutes. However, even during these months (May to August), it is crucial to maintain vigilance, especially in September and October, as UV levels rebound to extreme levels again. To stay safe, individuals are advised to consistently check the UV Index and employ sun protection strategies year-round, especially during peak UV times.
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 |
| Rio das Ostras | 16 | 15 | 13 | 11 | 8 | 6 | 7 | 9 | 12 | 13 | 14 | 16 |
| 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 |