Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Rio Branco, Brazil, where the sun's intensity can pose significant risks to skin health. Monitoring UV levels helps prevent sunburn and long-term skin damage, making it essential for outdoor activities. With a tropical rainforest climate, Rio Branco experiences high UV exposure, especially between 10:00 AM and 2:00 PM, when the UV Index peaks at an intense 12. Being aware of these levels can empower you to take protective measures, ensuring your time in the sun is safe and enjoyable.
The UV Index shows a dynamic pattern throughout the day, starting at a gentle 2 at 7:00 AM and gradually rising to a peak of 12 by 12:00 PM. This indicates a high risk of harm from unprotected sun exposure, especially during the midday hours when the sun is strongest. As the afternoon progresses, the index begins to decline, dropping to 6 by 2:00 PM and then further to 3 by 3:00 PM. By 4:00 PM, it decreases to a minimal level of 1, eventually settling at 0 by 6:00 PM and beyond. For those planning outdoor activities, it's crucial to protect your skin during those peak UV hours from 10:00 AM to 1:00 PM!
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 2 | low | 45 min |
08:00 | 4 | moderate | 30 min |
09:00 | 7 | high | 25 min |
10:00 | 10 | very high | 15 min |
11:00 | 12 | extreme | 10 min |
12:00 | 12 | extreme | 10 min |
13:00 | 9 | very high | 15 min |
14:00 | 6 | high | 25 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 Index levels exhibit significant seasonal variation, with the highest values recorded in the winter and early spring months. From January to April, the UV Index remains at an extreme level, peaking at 16, with a dangerously short burn time of just 10 minutes. The risk gradually decreases through the summer, reaching a very high level of 10 in June and July, before rising again to high extremes in August and September. Notably, the months of January through April, alongside November and December, are particularly high-risk for UV exposure. As such, residents and visitors are advised to take precautionary measures year-round, including wearing sun protection, seeking shade during peak sunlight hours, and limiting sun exposure, especially during these high-risk months.
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 |
Fortaleza UVI | 14 | 14 | 15 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 13 |
Rio Branco | 15 | 16 | 16 | 14 | 12 | 10 | 10 | 11 | 12 | 14 | 15 | 14 |