Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Sao Joao Nepomuceno, Brazil, as it plays a significant role in maintaining skin health and preventing sunburn. With a Cwa climate characterized by warm summers and a strong sun, awareness of daily UV levels can help you enjoy outdoor activities safely. Between 10:00 AM and 2:00 PM, when the index peaks at 7, the risk of harmful effects from unprotected sun exposure significantly increases. By monitoring the UV Index, you can take proactive steps to protect your skin while enjoying the vibrant atmosphere of this charming locality.
The UV Index reveals an early morning reprieve, starting at a gentle 1 at 7:00 AM and remaining low through 9:00 AM. However, as the sun climbs, intensity increases sharply, peaking at a 7 around noon, signaling the most potent UV exposure of the day. The early afternoon maintains a respectable UV level of 6 at 1:00 PM before gradually tapering off. By mid-afternoon, it drops to 4, then swiftly declines to 1 by 4:00 PM, and finally settles at 0 by 6:00 PM, marking the day's end for UV concern. This hourly trend underscores the importance of sun safety during peak hours, especially between 10 AM and 2 PM.
| 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 | 6 | high | 25 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 2 | low | 45 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, UV Index levels show significant fluctuations, with extreme levels dominating the winter months through early spring. From January to April, the UV Index consistently ranges from 11 to 17, categorizing exposure as extreme, meaning individuals can experience sunburn in as little as 10 minutes. This pattern of elevated UV levels continues with a brief decline in May through June, where the index falls to 8, moving into a very high exposure category with burn times increasing to 15 and 25 minutes respectively. However, July and August see a return to very high levels, again with a burn time of 15 minutes. As summer transitions into fall, the index rises again in September and remains high into November, marking these months as particularly risky. Residents and visitors should remain vigilant about sun protection during these high-risk months, particularly when UV Index levels soar, by seeking shade, wearing protective clothing, and applying sunscreen regularly.
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 |
| Sao Joao Nepomuceno | 17 | 15 | 13 | 11 | 8 | 7 | 8 | 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 |