Last updated: June 2, 2025
In Santo Anastacio, Brazil, being aware of the UV Index is crucial for protecting your skin and maintaining overall health. Understanding the levels of ultraviolet radiation throughout the day can help you prevent sunburn and reduce the risk of long-term skin damage. With a tropical climate that often exposes residents to elevated UV levels, especially during midday hours, it's essential to stay informed about the daily fluctuations. During peak times, such as noon to early afternoon, the UV Index can reach up to 7, indicating a high risk of harm from unprotected sun exposure. Stay vigilant and make informed choices to safeguard your skin while enjoying the vibrant sun-soaked days in Santo Anastacio!
The UV Index highlights a dynamic shift in sun exposure throughout the day. Starting off at a modest level of 1 at 07:00 and 08:00, the intensity gradually increases, peaking at 7 from 12:00 to 13:00, indicating high risk for harm from unprotected sun exposure. As the afternoon progresses, the index dips to 5 at 14:00 before gracefully descending to 3 by 15:00. The day winds down with the UV Index returning to its initial levels at 1 by 17:00, and then falling to 0 after 18:00, marking a safe end to sun exposure. It's a clear reminder to plan sun protection strategies, especially during the peak hours when the index reaches its zenith!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 5 | moderate | 30 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 2 | 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 demonstrates significant seasonal variation, with the highest levels occurring during the winter and late fall months. From January to April, the UV Index remains in the extreme exposure category (15 to 11), with a rapid burn time of just 10 minutes. This extreme risk continues into September and October, matching the highest readings, while November also presents a notable UV Index of 14. The high-risk months are primarily January through April, and again in September through November. As the months progress to May through August, the levels decrease slightly, categorized as very high to high, allowing slightly longer burn times of 15 to 25 minutes. It is advisable for both visitors and residents to exercise extreme caution during peak UV times, particularly in the first half of the year, using appropriate sun protection measures such as sunscreen, hats, and protective clothing.
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 |
| Santo Anastacio | 15 | 15 | 13 | 11 | 8 | 7 | 8 | 10 | 11 | 14 | 14 | 16 |
| 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 |