Last updated: January 18, 2026
Understanding the UV Index is crucial for residents and visitors of Santo Antonio do Sudoeste, Brazil, where the climate in the Cfa zone presents unique sun exposure challenges. Knowing the UV levels helps in preventing sunburn and promoting long-term skin health, especially during the peak hours of sun intensity between 11 AM and 2 PM when the UV Index reaches its maximum levels of 5 and 6. With the region's typical sunshine, being aware of local UV risks can significantly impact your outdoor activities and overall well-being. Stay informed and protect your skin!
The UV Index throughout the day presents a dynamic interplay of sunlight, peaking at 12:00 PM and 1:00 PM with a robust 6. Early risers will enjoy the gentle warmth with a UV Index of 0 at 7:00 AM, slowly climbing to 1 by 8:00 AM. As the morning progresses, it reaches 3 at 10:00 AM and then escalates to its highest at noon. Afternoon hours see a gradual decline, dipping back to 5 at 2:00 PM before gently dropping to 3 by 3:00 PM. As the sun sets, the index retreats below 1 from 5:00 PM onward, concluding with a soothing 0 at 6:00 PM and remaining steady until dusk. Make sure to stay protected during the peak hours, especially when the sun's rays are at their strongest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 60+ minutes |
| 08:00 | 3 | moderate | 30–60 min |
| 09:00 | 6 | high | 15–30 min |
| 10:00 | 9 | very high | 10–15 min |
| 11:00 | 13 | extreme | <10 minutes |
| 12:00 | 15 | extreme | <10 minutes |
| 13:00 | 15 | extreme | <10 minutes |
| 14:00 | 13 | extreme | <10 minutes |
| 15:00 | 10 | very high | 10–15 min |
| 16:00 | 6 | high | 15–30 min |
| 17:00 | 3 | moderate | 30–60 min |
| 18:00 | 1 | low | 60+ minutes |
| 19:00 | 1 | low | 60+ minutes |
The UV Index shows significant seasonal changes, with extreme levels persisting from January through April and again in October through December, indicating a high risk for skin damage with a burn time of just 10 minutes during these months. February and November consistently display the highest UV Index at 15, marking them as particularly hazardous. From May to September, the UV Index decreases but still presents notable risks, especially during July and August, when the index ranges from 6 to 8, requiring a burn time of 15 to 25 minutes. To protect against harmful UV radiation, both visitors and residents should take precautions during high-risk months, especially from January to April and in October and November, by wearing protective clothing, applying sunscreen, and seeking shade when possible.
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 |
| Santo Antonio do Sudoeste | 15 | 15 | 13 | 11 | 7 | 5 | 6 | 8 | 10 | 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 |