Last updated: July 2, 2025
Understanding the UV Index in Formosa do Rio Preto is crucial for safeguarding your skin against harmful ultraviolet (UV) radiation. With a tropical climate that often sees high UV exposure, particularly between 10 AM and 2 PM when levels peak at a staggering 11, it's essential to be aware of the risks. This knowledge not only helps in preventing painful sunburns but also contributes to long-term skin health. By staying informed about daily UV levels, residents can take proactive measures to enjoy the sun safely. Remember, even on seemingly mild days, UV rays can still pose a threat—so don’t forget to protect yourself!
As the day dawns, the UV Index starts at a mild 1 at 7:00 AM, gradually climbing to 2 by 8:00 AM. By 9:00 AM, it quickly rises to 4, signaling a more pronounced sun exposure. The peak intensity is reached at 12:00 PM with a striking 11, indicating a high risk of harm from unprotected sun exposure. Fortunately, this intensity decreases throughout the afternoon, dropping to 4 by 3:00 PM and further to 2 by 4:00 PM. As the sun sets, the UV Index falls to 0 after 6:00 PM, bringing relief as daylight fades. To make the most of sun exposure, plan outdoor activities during the morning or early afternoon while remaining mindful of peak hours!
| 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 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | 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 |
The UV Index experiences extreme levels throughout most of the year, with January to April consistently showing values between 14 and 16. May marks a slight decline to an index of 12 before tapering to very high levels of 10-12 from June to August. Following a brief peak in September, the UV Index returns to extreme levels for the remaining months. High-risk months are January through April, and notably, July to October maintains high exposure categories. Visitors and residents should exercise caution during these months, ensuring to use adequate sun protection—such as sunscreen, hats, and sunglasses—and limit exposure times to avoid serious sunburn, especially with a burn time as quick as 10 to 15 minutes under high UV conditions.
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 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |
| Formosa do Rio Preto | 16 | 15 | 15 | 14 | 12 | 10 | 11 | 12 | 13 | 15 | 15 | 15 |