Last updated: August 1, 2025
In Valparaíso, Brazil, understanding the UV Index is crucial for safeguarding your skin's health against harmful ultraviolet rays. With a climate that often features sunny days, the potential for sunburn peaks significantly, especially during midday hours when the UV Index soars to 8. Awareness of UV levels is essential not only for preventing immediate skin damage but also for reducing long-term risks such as skin cancer. As you enjoy the vibrant culture and stunning coastline of Valparaíso, keep an eye on UV forecasts to ensure you’re protected while having fun in the sun!
As the sun rises, the UV Index begins its ascent, starting at a gentle 1 by 7:00 AM and remaining low at 8:00 AM. By 9:00 AM, it edges up to 2, but the real intensity kicks in at 10:00 AM with a surge to 4. The peak occurs around 12:00 PM and 1:00 PM, where it reaches a scorching 8, representing a significant rise in UV exposure. As the afternoon unfolds, the index begins its descent, dropping to 6 by 2:00 PM and easing to 4 by 3:00 PM. Before the sun sets, the UV levels taper off quickly, with readings of 2 at 4:00 PM and declining to 0 by 6:00 PM. This hourly data serves as a reminder to stay protected during peak UV hours, particularly between 11:00 AM and 1:00 PM.
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 | 6 | high | 25 min |
11:00 | 9 | very high | 15 min |
12:00 | 10 | very high | 15 min |
13:00 | 10 | very high | 15 min |
14:00 | 8 | very high | 15 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 seasonal UV changes indicate that exposure levels are consistently high, particularly from January to April, where the UV Index remains in the extreme category, peaking at 16 in February and December. High-risk months include January, February, March, April, September, October, and November, as they all feature an extreme UV Index that can lead to sunburn in as little as 10 minutes. Conversely, the summer months of May, June, July, and August experience a drop to very high and high categories, with slightly longer burn times of 15 to 25 minutes. Visitors and residents should take precautions during all months, especially in extreme UV conditions, by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen to minimize the risk of skin damage.
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 |
Valparaiso | 15 | 16 | 13 | 11 | 8 | 7 | 8 | 10 | 12 | 14 | 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 |