Last updated: June 2, 2025
In Caieiras, Brazil, being aware of the UV Index is crucial for safeguarding your skin health against the sun's harmful rays. Understanding UV levels can help you prevent sunburn and reduce long-term skin damage, making it essential for those who enjoy outdoor activities. Caieiras, with its Cfa climate, experiences varying UV exposure throughout the day, peaking at a UV Index of 6 between 11:00 AM and 1:00 PM. This highlights the importance of taking protective measures during these hours to ensure a safe and enjoyable experience under the sun. Remember, staying informed about UV levels not only protects your skin but also promotes a lifetime of healthy habits!
The UV Index throughout the day presents an interesting fluctuation, starting off quite low with a maximum of 1 at both 07:00 and 08:00. As the sun rises higher, the intensity increases sharply, peaking at 6 from 11:00 to 13:00. This is the critical time to protect your skin, as a UV Index of 6 indicates a moderate risk of harm from unprotected sun exposure. The afternoon sees a gradual decline, with numbers dropping back to 2 by 15:00 and returning to 1 by 16:00 and 17:00. Finally, as the day comes to a close, the UV Index falls to 0 by 18:00 and remains there through the evening, reminding us that while the sun's rays can be strong during the day, they also retreat as the sun sets.
| 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 | 6 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 2 | low | 45 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 |
The UV Index exhibits significant seasonal fluctuations, with the highest levels consistently occurring in the winter months of January and February, where both register at 16, categorizing exposure as extreme and necessitating a mere 10 minutes of sun exposure before burning. Following closely, March through April also showcases extreme UV levels, before tapering slightly in May, where the index drops to 8 but remains in the very high range. June and July see mild reductions, landing at 6 and 7, respectively, representing high exposure risks with a burn time of 25 minutes. Nevertheless, as the season transitions back to fall, September and October return to extreme levels, particularly notable in September at 11 and October at 13, while November maintains a high index of 14. Visitors and residents should remain vigilant from January through April and again in September and October, as these are critical months for high UV exposure risks. It's advisable for everyone to adopt protective measures, including wearing sunscreen and protective clothing, during these high-risk periods to minimize adverse effects from UV 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 |
| Caieiras | 16 | 16 | 13 | 11 | 8 | 6 | 7 | 9 | 11 | 13 | 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 |