Last updated: June 2, 2025
In Santa Gertrudes, Brazil, understanding the UV Index is essential for safeguarding your skin against the harmful effects of ultraviolet radiation. With the region's Cfa climate bringing warm, sunny days, it's crucial to recognize how varying UV levels can influence sunburn risk and overall skin health. Throughout the day, UV exposure peaks around midday, reaching levels as high as 6 from 11:00 AM to 1:00 PM, underscoring the need for awareness and protection during those critical hours. By tracking the UV Index, residents and visitors can make informed choices about sun safety, ensuring their time outdoors remains enjoyable and healthy.
As the day unfolds, the UV Index begins to rise, peaking sharply around midday. From a gentle 1 at 7 AM, it escalates to a moderate 6 between 11 AM and 1 PM, signaling peak sun exposure. During these crucial hours, it's essential to protect your skin with sunscreen and wear appropriate clothing. As the afternoon progresses, the intensity wanes, dropping to 4 at 2 PM and further declining to 3 by 3 PM. By 4 PM, it returns to a safe 1, and finally settles to 0 after sunset, making late afternoon and evening hours ideal for outdoor activities without the risk of UV damage. Stay informed and enjoy the sun responsibly!
| 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 | 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 |
Throughout the year, the UV Index shows significant seasonal changes, with high-risk months primarily falling between January and April, where the UV Index remains at an extreme level of 16 to 11 and the burn time is limited to just 10 minutes. This level of risk returns in September through November, where the index spikes again to numbers as high as 14 for November. May introduces a decrease to a very high category with an index of 8, followed by June and July, which stabilize at a high level with an increased burn time of 25 minutes. By August, there's a resurgence to very high, so caution is advised. Therefore, visitors and residents should prioritize sun safety by seeking shade, wearing protective clothing, and applying sunscreen, especially during the months of January to April and September to November when the risk of UV exposure is greatest.
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 |
| Santa Gertrudes | 16 | 16 | 13 | 11 | 8 | 6 | 7 | 10 | 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 |