Last updated: August 1, 2025
Understanding the UV Index is crucial for residents and visitors in Sao Lourenco do Sul, Brazil, where sun exposure can significantly impact skin health and overall well-being. With a climate characterized by warm summers and mild winters, awareness of varying UV levels helps in preventing sunburn and long-term skin damage. The UV readings here range from 0 to 5 throughout the day, peaking at midday when the risk is highest. By taking the time to understand the UV Index, you can enjoy the beautiful outdoors while protecting your skin from harmful effects of UV radiation.
The UV Index throughout the day presents a notable pattern, starting from a maximum of 0 at 07:00, indicating minimal risk. As the morning progresses, 08:00 and 09:00 see a gentle rise to 1, suggesting low exposure. By 10:00, the index ramps up to 3, reflecting moderate sun intensity. The peak arrives at noon, with a UV Index of 5, signifying a higher risk of harm from unprotected sun exposure. Throughout the afternoon, it fluctuates slightly, dropping to 4 by 13:00, and remaining steady until 14:00. The sun's intensity recedes in the late afternoon, falling to 2 at 15:00 and gradually back down to 1 by 17:00. As evening sets in, the UV Index drops to 0 by 18:00, prompting a safe end to sun exposure. Overall, this data underscores the importance of sun safety measures during the peak midday hours.
| 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 | 6 | 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 |
Throughout the year, UV exposure varies significantly, with the highest risk occurring from November to March. During these months, the UV Index reaches extreme levels, peaking at 15 in December and remaining at 14 in January and November, with a dangerously short burn time of just 10 minutes. As spring approaches, in April, the UV Index drops to 9, categorized as very high, allowing for a slightly longer burn time of 15 minutes. By May and June, the UVs moderate to an index of 5 and 4, respectively, with burn times extending to 30 minutes. However, the risk escalates again in September, returning to a very high level of 9. Visitors and residents should exercise caution, especially in high-risk months, ensuring to apply broad-spectrum sunscreen, wear protective clothing, and seek shade during peak sun hours to minimize potential harm from UV radiation.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sao Lourenco do Sul | 14 | 13 | 12 | 9 | 5 | 4 | 4 | 7 | 9 | 12 | 14 | 15 |
| 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 |