Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Sao Fidelis, Brazil, as it directly impacts your skin health and sunburn prevention. With the region's Aw climate—characterized by tropical weather—it's essential to be aware of the UV levels, particularly during peak hours when values can soar to 8. This indicates a high risk of harm from unprotected sun exposure, making it vital to take precautions. By staying informed about the UV Index, you can enjoy the sunny days of Sao Fidelis while safeguarding your skin against the harmful effects of ultraviolet radiation.
The UV Index throughout the day reveals a sharp increase in intensity, peaking around 12:00 PM, where it reaches an impressive 8. Early morning hours start softly with a maximum of 1 at 07:00, gradually climbing to 3 by 09:00 and hitting 6 at 10:00. 11:00 marks a significant rise to 7, before hitting the day’s zenith at 12:00. As the afternoon progresses, we see a decline, dropping to 5 by 14:00 and diminishing further to 3 by 15:00. The UV Index then falls sharply in the late afternoon and evening, settling back down to 1 by 17:00 and ultimately reaching 0 as night takes over. It’s crucial to stay safe under the sun during those peak hours, particularly between 11:00 AM and 2:00 PM!
| 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 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | 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 distinct seasonal changes, with the highest levels occurring in the winter months. From January to April, the UV Index remains in the extreme exposure category, peaking at 16 in January and gradually decreasing to 11 in April, leaving individuals with a burn time of just 10 minutes. As summer approaches, the index drops to 6 in June and stabilizes at 8 to 9 during July and August, classified as very high exposure, extending burn time to 15 minutes. In September, the UV Index surges back to 12, indicating extreme risk once again, and remains high through to November, where it reaches 14. Following this pattern, visitors and residents should take extra precautions during these high-risk months, particularly from January to April and again in September to November, by wearing sunscreen, protective clothing, and seeking shade during peak sun hours to minimize the risk of skin damage.
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 Fidelis | 16 | 15 | 13 | 11 | 8 | 6 | 8 | 9 | 12 | 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 |