Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Joacaba, Brazil, as it serves as a vital tool in safeguarding against harmful ultraviolet rays. With its Cfa climate characterized by warm summers and mild winters, Joacaba sees varying UV levels throughout the day—peaking at a 7 between noon and 1 PM. Knowing these levels is essential for preventing sunburn and promoting long-term skin health. By being aware of the daily UV index, you can take proactive measures to enjoy the sun safely while minimizing the risks associated with high UV exposure.
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 |
The UV Index experiences significant seasonal fluctuations, with extreme levels occurring from January to March, as well as in September, October, and November, where burn times are as brief as 10 minutes. April marks a transition to very high exposure conditions with a UV Index of 10 and an increased burn time to 15 minutes. Subsequently, May and July present high UV levels (UV Index of 7 and 6, respectively), allowing slightly longer exposure times of 25 minutes. In particular, August also sees a very high UV Index of 8, reducing burn time to 15 minutes. From June through August, the Index drops to moderate levels, with burn times extending to 30 minutes. Visitors and residents should exercise caution during high-risk months, particularly from January through March and September through November, using sunscreen, protective clothing, and seeking shade to minimize potential skin damage.
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 |
| Joacaba | 15 | 15 | 13 | 10 | 7 | 5 | 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 |