Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Araguaiana, Brazil, where the climate can expose you to significant UV radiation, especially during peak hours. As a vibrant place with a tropical climate (Aw), the sun's rays can often reach dangerous levels, with indices peaking at 9 around midday. Being aware of UV levels helps you take proactive measures against sunburn and long-term skin health issues. With the UV Index fluctuating throughout the day—from a low of 1 at dawn to a high of 9—making informed decisions about sun exposure can drastically reduce the risk of harmful effects on your skin. Stay safe and enjoy the sunshine while keeping your skin protected!
The UV Index reflects a dynamic day of sun exposure, starting off gently with a maximum of 1 at 7:00 AM and 8:00 AM. As the sun climbs higher, the intensity builds, peaking at a formidable 9 from 12:00 PM to 1:00 PM, signaling a prime time for sun safety awareness. By 11:00 AM, it reaches 8, emphasizing the importance of protective measures. The intensity then gently wanes, dropping to 7 by 2:00 PM, before declining to 5 at 3:00 PM, and further dimming to 3 by 4:00 PM. As the day winds down, the UV Index diminishes significantly, returning to 1 at 5:00 PM and 6:00 PM, and finally tapering off to 0 by 7:00 PM. This chart highlights the importance of staying vigilant under the sun, particularly during those midday hours when UV exposure is at its peak.
| 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 | 8 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index shows significant seasonal variation, with extreme levels persisting from January to April and returning in August to November. High-risk months include January through April and August through November, where the UV Index peaks at 16 in February and December, indicating a very short burn time of just 10 minutes. Residents and visitors should prioritize sun protection during these periods, wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak UV hours. In the remaining summer months of May to July, the UV Index remains very high, inviting caution, especially with a burn time of about 15 minutes. It's essential to stay informed and take appropriate measures to safeguard against harmful UV exposure throughout the year.
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 |
| 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 |
| Araguaiana | 15 | 16 | 14 | 12 | 10 | 9 | 9 | 11 | 12 | 15 | 15 | 16 |
| Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |