Last updated: June 2, 2025
Understanding the UV Index is crucial for the residents and visitors of Barra de São Francisco, Brazil, where the tropical climate can bring about significant sun exposure. Knowing the daily UV levels helps in preventing sunburn and maintaining overall skin health—essential for enjoying the outdoors safely. With peak UV Index values soaring to 8 around midday, awareness is key to minimizing the risk of overexposure. Whether you're soaking up the sun or exploring local landscapes, staying informed about UV risks ensures your time in this vibrant region is both enjoyable and healthy.
The UV Index throughout the day reveals a fascinating curve of sun exposure. Starting early, at 7:00 AM, it registers a low of 1, gradually climbing to its peak of 8 around noon. This notable surge underscores the importance of sun protection, especially from 11:00 AM to 1:00 PM, when the index reaches 7 and 8, respectively. As the afternoon progresses, the UV Index begins to decline, dipping to 4 by 2:00 PM and further down to 1 by 5:00 PM. By the time the sun sets, the UV Index drops to 0, indicating a safe window to enjoy the cooler evening hours without the risk of harmful sun exposure. Remember, during the peak times, sunscreen and protective clothing are vital for your safety!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 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 |
During the year, the UV Index exhibits pronounced seasonal fluctuations, with extreme levels persisting from January through April and again in August through November. The months of January, February, March, April, August, September, October, November, and December all fall within the extreme exposure category, necessitating vigilance, as the burn time is a mere 10 minutes. Conversely, May, June, and July experience a slightly lower yet still concerning UV Index, classified as very high, with a burn time of 15 minutes. Visitors and residents should take precautions during these high-risk months by seeking shade, wearing protective clothing, and applying sunscreen regularly to mitigate the harmful effects of UV radiation.
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 |
| Barra de Sao Francisco | 15 | 15 | 14 | 12 | 9 | 8 | 9 | 11 | 12 | 14 | 15 | 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 |