Last updated: June 2, 2025
In Sao Joao do Piaui, Brazil, staying informed about the UV Index is essential for protecting your skin from harmful ultraviolet rays. Understanding UV levels is crucial for preventing sunburn and maintaining overall skin health, especially in this BSh climate, where the sun's intensity can peak. With UV Index values soaring to 11 between 12 PM and 1 PM, residents and visitors alike should take precautions during these hours to avoid potential skin damage. By being UV-aware, you can enjoy the vibrant outdoor lifestyle of Sao Joao do Piaui while safeguarding your skin from the sun's harmful effects.
As the sun rises, the UV Index starts off low at 1 at 7:00 AM, slowly increasing to 3 by 8:00 AM. By 9:00 AM, it reaches 5, suggesting that the rays are becoming more intense. The peak arrives at 12:00 PM, where a high of 11 is recorded, indicating a very high risk of harm from unprotected sun exposure. The afternoon still holds lingering rays, with values descending gradually from 9 at 1:00 PM to 4 by 3:00 PM. As the sun begins to set, the index drops sharply to 2 at 4:00 PM, and ultimately to 0 after 6:00 PM. Remember, during the peak hours, especially between 10:00 AM and 2:00 PM, protecting your skin is essential!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 9 | 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 remains consistently high throughout the year, with extreme exposure categories dominating every month. Notably, January to March see a peak UV Index of 15, marking these months as high-risk for skin damage, where a mere 10 minutes of unprotected sun exposure can lead to burns. The UV levels gradually decrease from April to June, dropping to 11, but still maintaining an extreme level of risk. Even later months into August and September, the UV Index remains significant, reaching 12 and 13, respectively. With high UV levels persisting into October and November (both at 14), it’s crucial for visitors and residents to take proactive measures, including wearing sunscreen, hats, and UV-protective clothing, especially during the midday hours, to mitigate the risks associated with prolonged sun exposure.
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 |
| Sao Joao do Piaui | 15 | 15 | 15 | 14 | 12 | 11 | 11 | 12 | 13 | 14 | 14 | 14 |