Last updated: May 3, 2025
Awareness of the UV Index is crucial for residents and visitors of Penha, Brazil, where the warm Cfa climate creates ideal conditions for outdoor activities—and also increases exposure to harmful ultraviolet radiation. Understanding UV levels can be the difference between enjoying the sun and suffering from painful sunburns or long-term skin damage. With UV Index levels peaking at 7 around noon, it's essential to take precautions like wearing sunscreen and protective clothing when the sun is at its strongest. Protect your skin health and enjoy the sunny delights of Penha safely by staying informed about daily UV exposure risks.
The UV Index data for the day reveals a notable peak around noon, reaching a maximum of 7, indicating a high level of sun exposure. The morning begins with a mild index, starting at 1 at 07:00 and 08:00. By 09:00, it rises to 2, slowly climbing to 4 by 10:00. The intensity escalates significantly by 11:00 and hits its zenith at 12:00. After that, the UV levels gradually decline, dropping to 6 at 13:00 and 5 at 14:00, before falling to 3 by 15:00. As the evening approaches, the UV Index decreases rapidly, returning to 1 by 16:00 and reaching 0 by 18:00, signaling an end to the sun's harmful rays for the day. Remember to stay protected during those peak hours!
| 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 | 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 |
The UV Index experiences notable fluctuations throughout the year, with the highest levels recorded during the winter months and a gradual decrease into the summer. January, February, and March consistently display extreme UV levels, peaking at 15, which indicates an urgent need for protective measures—10 minutes of sun exposure can result in burns. As April arrives, the UV Index drops slightly to 10 but remains within the very high category, allowing for a 15-minute burn time. The summer months of June and July see a moderate UV Index of 5, offering more leeway with a burn time of 30 minutes. However, as August and September return to very high levels, with indices of 8 and 10, the risk of sun damage reemerges, demanding attention to sun protection in just 15 minutes. This trend continues into October and November, where UV readings climb back to extreme levels. Residents and visitors alike should take care during January to March and October to November, as these months are particularly high-risk for UV exposure. It's advisable to wear protective clothing, apply sunscreen regularly, and seek shade during peak sunlight hours to mitigate potential harm from the sun's rays.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Penha | 15 | 14 | 12 | 10 | 7 | 5 | 5 | 8 | 10 | 12 | 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 |