Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Sao Manuel, Brazil, where the climate typifies a humid subtropical environment. With UV levels capable of reaching as high as 8, being aware of these readings can significantly aid in sunburn prevention and the long-term health of your skin. The typical exposure risks in Sao Manuel peak during midday hours, making it essential to protect yourself from harmful effects. By staying informed about the UV Index, you can enjoy the sun responsibly and keep your skin safe.
At sunrise, the UV Index begins at a gentle 1 at 07:00, rising gradually as the sun climbs higher. By 09:00, it reaches 3, indicating a moderate level of UV radiation. The heat of the day peaks at 12:00 with a high of 8, suggesting it’s time to seek shade or apply sunscreen. As the afternoon progresses, the index slightly drops to 7 at 13:00 and continues to decline, settling at 3 by 15:00. As the sun starts to set, the risk diminishing to 1 at 17:00 and finally dropping to 0 by 18:00, signaling a safer time for outdoor activities as the day winds down. Be mindful of the midday sun to protect your skin!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 6 | high | 25 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 |
The UV Index exhibits significant seasonal changes, with the highest levels typically occurring during the winter and early spring months. From January to March, the UV Index remains in the extreme category (15-13), indicating a burn time of just 10 minutes. This pattern continues into April (UV Index 11) before declining in May to a very high level (UV Index 8) with a burn time of 15 minutes. June and July see a slight reduction to a high level (UV Index 7) allowing for a longer burn time of 25 minutes. However, the UV levels spike again in August (UV Index 10) before sharply rising in September to extreme (UV Index 12), while October and November maintain extreme levels (UV Index 13-14). December reaches its peak at a UV Index of 16, still classified as extreme. Visitors and residents should take extra precautions during high-risk months—especially from January to April and September to November—by applying sunscreen, wearing protective clothing, and minimizing sun exposure during peak hours to reduce the risk of UV-related harm.
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 |
| Sao Manuel | 15 | 15 | 13 | 11 | 8 | 7 | 7 | 10 | 12 | 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 |