Last updated: July 2, 2025
In Sao Borja, Brazil, understanding the UV Index is crucial for protecting your skin and overall health. UV exposure can lead to painful sunburns and long-term skin issues, making it essential to stay informed about the daily UV levels. With a Cfa climate, Sao Borja experiences intense sun exposure, particularly during the midday hours when the UV Index peaks at values of 5 around noon. Being aware of these fluctuations not only helps you enjoy the beautiful Brazilian sun safely but also ensures you take the necessary precautions to mitigate harmful effects on your skin.
The UV Index data for the day paints a clear picture of sun intensity as the hours progress. Starting at 07:00, the index is at a comfortable 0, allowing for a worry-free morning. As we move into the 08:00 and 09:00 hours, it remains low at 1, perfect for outdoor activities. This gradual increase peaks at 12:00 and 13:00, reaching a maximum of 5, indicating that sun protection is a must during these hours. The intensity then gradually tapers off, bringing it back down to 4 at 14:00 and declining further to 0 by 19:00. Embrace the early hours, but don’t forget your sunscreen when the sun is at its zenith!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 2 | low | 45 min |
| 11:00 | 4 | moderate | 30 min |
| 12:00 | 5 | moderate | 30 min |
| 13:00 | 5 | moderate | 30 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV exposure fluctuates significantly, peaking during the winter months and again in late fall, with January, February, October, November, and December all categorized under extreme exposure (UV Index 14-15) and a quick burn time of just 10 minutes. March marks a slight decrease but remains extreme with an index of 12. As spring approaches, by April the risk diminishes slightly to very high (UV Index 9) but still requires caution, with a burn time of 15 minutes. The summer months, though moderate (UV Index 5-6), still carry a notable risk, particularly in August when it returns to high (UV Index 7); careful monitoring is necessary with burn times of 25-30 minutes. September sees a resurgence in risk with another brief period of very high exposure. Therefore, visitors and residents are strongly advised to take protective measures from November through March and remain vigilant in April and August to prevent skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sao Borja | 15 | 14 | 12 | 9 | 6 | 5 | 5 | 7 | 9 | 13 | 14 | 14 |
| 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 |