Last updated: July 2, 2025
Being aware of the UV Index is crucial for the residents and visitors of Tiradentes, Brazil, where the Cwa climate brings warm summers and elevated sun exposure risks. Understanding UV levels is essential for preventing sunburn and promoting long-term skin health, as harmful rays can spike significantly during midday hours. For instance, as the sun reaches its peak, the UV Index can soar to 8, indicating a high risk of harm from unprotected sun exposure. Keeping an eye on these levels allows you to enjoy the beauty of Tiradentes while safeguarding your skin from potential damage.
The UV Index throughout the day showcases an interesting pattern of solar intensity and risk levels. From the early hours, the index starts low at 1 by 07:00, gradually climbing to a moderate 3 by 09:00. The sun reaches its peak intensity at 11:00, where the index hits 8, remaining steady until 13:00—a time best reserved for shade-seekers and sunscreen users. As the afternoon progresses, the intensity begins to wane, dipping back to 3 by 15:00, and then dropping to a negligible 0 by 18:00, marking a safe end to the sun's more harmful rays. Stay vigilant during those midday hours for optimal sun safety!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 8 | 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 exhibits significant seasonal fluctuations, with the highest levels occurring from January to April, reaching an extreme peak of 17 in January, and remaining at 16 through February. March and April follow closely, both categorized as extreme, with a UV Index of 14 and 12, respectively. May marks a slight decrease to 9, transitioning to a very high exposure category. As summer approaches, June sees a further decline to a 7 (high), while July and August maintain a very high risk with indices of 8 and 10, respectively. The UV risk escalates again in September to 13, falling back to extreme levels of 14 in October and November, before ending the year with a 16 in December. Visitors and residents should take extra precautions during the high-risk months of January through April and September through November, when burn times are as low as 10 minutes. It is advised to wear protective clothing, apply sunscreen regularly, and seek shade to minimize UV exposure during these periods.
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 |
| Tiradentes | 17 | 16 | 14 | 12 | 9 | 7 | 8 | 10 | 13 | 14 | 14 | 16 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |