Last updated: June 2, 2025
Understanding the UV Index in Porto União, Brazil is crucial for safeguarding your skin and overall health. With the region's Cfa climate, residents and visitors alike face varying levels of UV radiation throughout the day. As UV levels peak around noon, reaching a maximum of 6, being aware of these fluctuations can help you prevent sunburn and long-term skin damage. Whether you're enjoying the outdoors or engaging in daily activities, staying informed about UV exposure risks is essential for maintaining your skin's health and well-being.
The UV Index for the day showcased a dramatic rise in intensity as the sun climbed higher, peaking between 12:00 PM and 1:00 PM with a noteworthy 6. Starting the day at a negligible 0 at 7:00 AM, the index gradually increased to 2 by 9:00 AM, making mid-morning the perfect time for a sun-soaked outing. As the clock ticked towards noon, the UV index reached 5, reminding us to take precautions. By 2:00 PM, it slightly dipped to 4 but still required awareness. Afterward, the UV levels began to decline, falling back to 1 by late afternoon and eventually returning to 0 as night approached, indicating a safe time for outdoor activities without the risk of UV exposure. Stay sun-smart!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 3 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 4 | 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 |
Throughout the year, the UV Index in our region exhibits significant seasonal variations, with the highest risk months occurring from January to April, where the UV Index consistently reaches extreme levels between 15 and 13 and the burn time is merely 10 minutes. As we transition into May through July, the UV Index decreases slightly to 7 and 6, categorized as high, allowing for a longer burn time of 25 minutes. However, August experiences a spike again to 8, deemed very high, with a burn time of 15 minutes. In September and October, the UV levels rise back to extremes at 11 and 13, leading into the winter months of November and December, which again reflect extreme UV levels of 15. Visitors and residents should take preventive measures, such as wearing sunscreen, protective clothing, and sunglasses during the high-risk months, especially from January to April, and remain vigilant even in the late summer and early autumn, ensuring safe sun exposure throughout the year.
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 |
| Porto Uniao | 15 | 15 | 13 | 11 | 7 | 6 | 6 | 8 | 11 | 13 | 15 | 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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |