Last updated: July 2, 2025
In Rio Branco, Brazil, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. The city's tropical climate exposes residents and visitors to varying UV levels throughout the day, peaking at a risky UV Index of 10 around midday. Understanding these levels can empower locals to take necessary precautions against harmful ultraviolet radiation, especially when outdoor activities are most enjoyable. With UV exposure risks on the rise, being informed about the UV Index is a simple yet effective way to protect yourself and ensure a healthy, sun-safe lifestyle in this vibrant Amazonian city.
As the sun rises, the UV Index starts low at 1 at 07:00, making it a safe time for early birds. By 08:00, it climbs to 3, indicating a slight increase in UV exposure. The peak arrives sharply at 11:00 and 12:00, hitting a maximum of 10—a strong reminder to wear sunscreen and seek shade. Following this, the index gradually decreases, dipping to 6 by 14:00 and dropping further to 3 by 15:00. As the day winds down, UV levels return to a comfortable 1 by 16:00, fading to 0 by 18:00. This hourly pattern emphasizes the importance of midday protection while reminding us of the sun's dynamic presence throughout the day.
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 1 | low | 45 min |
08:00 | 3 | moderate | 30 min |
09:00 | 6 | high | 25 min |
10:00 | 8 | very high | 15 min |
11:00 | 10 | very high | 15 min |
12:00 | 10 | very high | 15 min |
13:00 | 8 | 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 |