Last updated: June 2, 2025
In Sao Borja, Brazil, being aware of the UV Index is essential for safeguarding your skin and overall health. Understanding UV levels is crucial to preventing sunburn and reducing the risk of long-term skin damage. With a climate classified as Cfa, Sao Borja experiences distinct seasonal variations in sunlight, leading to varying UV exposure risks throughout the day. During peak hours, especially between 11 AM and 1 PM, UV Index levels can reach as high as 5, signaling a moderate risk of harm from unprotected sun exposure. Stay informed and protect yourself to enjoy the vibrant sun-soaked days in this beautiful region!
The UV Index data for the day reveals a progressive ascent in solar intensity, starting from a peaceful 0 at 07:00. As the sun rises higher in the sky, it peaks at 5 between 12:00 and 13:00, indicating a moderate risk for sun exposure. 11:00 and 10:00 see values of 4 and 2 respectively, signaling an increasing need for sun safety measures. As the afternoon unfolds, readings gently descend, dropping back to 3 by 15:00 and tapering to 0 after 18:00. Overall, it’s a day where vigilance is key during the midday hours, while mornings and evenings offer a respite from harmful rays.
| 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 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | 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 |