Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Itahnaem, Brazil, where the sun shines brightly under a Cfa climate. With UV levels peaking at 7 around noon, it’s essential to grasp the importance of these readings to safeguard against sunburn and promote long-term skin health. By monitoring the UV Index, you can take proactive measures to protect yourself during the most hazardous hours of the day, ensuring your outdoor activities are both enjoyable and safe from harmful ultraviolet exposure.
As the sun rises, the UV Index remains low at 1 from 07:00 to 08:00, offering a gentle start to the day. However, as the hours progress, the intensity increases, reaching 3 by 09:00 and peaking at 7 between 11:00 and 13:00. This midday surge signifies the sun's powerful rays, urging everyone to take precautions for skin protection. As the afternoon wanes, the UV Index begins to decline, dropping to 5 at 14:00, and further decreasing to 3 by 15:00. The evening brings relief, with the index falling to 1 by 16:00 and 0 from 18:00 onward. Embrace the early hours for outdoor activities, but stay vigilant during lunchtime when the sun is at its strongest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | 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 | 7 | 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, the UV Index exhibits significant seasonal variations, with the highest levels occurring in the winter months and early spring. From January to March, the UV Index remains extremely high, peaking at 15, indicating a risk of harm from unprotected sun exposure in just 10 minutes. The months of April and May see a slight decrease but remain very high, with a UV Index of 10 and 8 respectively, requiring 15 minutes of protection against sunburn. June and July provide some respite, classifying as high exposure with a burn time of 25 minutes, but the Index again spikes in August. The late summer and early fall return to extreme levels, particularly in September and October, where the Index hits 11 and 13. Finally, the UV levels surge back to extreme in November and December, which are crucial months for residents and visitors to emphasize sun safety. High-risk months include January, February, March, September, October, and November, where the recommended exposure time is only 10 minutes. To protect against harmful UV rays, it is essential for individuals to seek shade, wear sunscreen, and don protective clothing, especially during these peak months.
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 |
| Itanhaem | 15 | 14 | 12 | 10 | 8 | 6 | 6 | 8 | 11 | 13 | 14 | 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 |