Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Mata de São João, Brazil, where the sun's rays can be particularly intense. With a tropical climate that promotes outdoor activities year-round, it’s essential to be aware of the UV levels to protect yourself from harmful effects such as sunburn and long-term skin damage. Daily UV exposure significantly increases from mid-morning to early afternoon, peaking at 11 around noon. By staying informed about the UV Index, you can enjoy the beautiful beaches and vibrant nature of Mata de São João while prioritizing your skin health and overall well-being.
The UV Index starts off low at 7:00 AM with a reading of 1, making it a safe time to be outdoors. As the sun rises higher, the index climbs dramatically, peaking at 11 by 11:00 AM—a clear indicator that sun protection is essential during this time. Although it remains high at 10 at 12:00 PM, there's a gradual decline from 1:00 PM, where it drops to 8. By mid-afternoon, it further decreases to 6 at 2:00 PM and continues to dwindle until it reaches 0 after 6:00 PM. The data highlights the importance of being sun-smart during the peak hours of 10 AM to 2 PM, when UV exposure is at its highest, ensuring you stay safe while enjoying the outdoors.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 6 | high | 25 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 extreme levels throughout most of the year, with particularly high-risk months occurring from January to April, where the Index consistently reaches 14, requiring just 10 minutes of exposure before burning occurs. Although there is a slight reduction in June and July with a UV Index of 9 and 10, respectively, the risk remains very high, with a burn time of 15 minutes. From August to November, the UV Index rises again, reaching levels of 12 to 15, and maintaining a burn time of 10 minutes in most cases. Given these seasonal fluctuations, it is crucial for both visitors and residents to take protective measures such as applying sunscreen, wearing protective clothing, and seeking shade during peak hours to minimize skin damage from UV exposure.
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 |
| 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 |
| Mata de Sao Joao | 14 | 14 | 14 | 13 | 11 | 9 | 10 | 12 | 12 | 14 | 15 | 14 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |