Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Piraju, Brazil, where the climate can significantly influence sun exposure. With its Cfa climate, characterized by warm summers and mild winters, awareness of UV levels becomes essential for preventing sunburn and maintaining skin health. On clear days, UV levels can peak at 6 during midday, indicating a heightened risk for skin damage. By keeping an eye on the UV Index, you can better protect yourself and enjoy the beautiful Brazilian sun safely.
The UV Index for the day shows a notable increase in solar intensity as the morning unfolds. Starting at a mild 1 between 07:00 and 09:00, the index rises sharply, peaking at 6 from 11:00 to 13:00. This is a clear indication that midday sun demands caution, with later hours dropping to 5 at 14:00 and gradually decreasing toward evening. By 18:00 and 19:00, the UV Index dips to 0, signaling a safe time to be outdoors without sun protection. Overall, this day encourages sun safety practices during those peak hours when the UV rays are most potent.
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 1 | low | 45 min |
08:00 | 1 | low | 45 min |
09:00 | 2 | low | 45 min |
10:00 | 4 | moderate | 30 min |
11:00 | 6 | high | 25 min |
12:00 | 6 | high | 25 min |
13:00 | 6 | high | 25 min |
14:00 | 5 | moderate | 30 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 |
The UV Index varies significantly throughout the year, with extreme levels marking the high-risk months of January through April and returning in September to November. During these months, protective measures are crucial, as the burn time is as low as 10 minutes. The UV Index peaks in February and December at 15 and 16, respectively, while it remains at 11 in April. As spring transitions to summer, the Index decreases slightly, with May to July showing very high to high levels and longer burn times of 15 to 25 minutes. Moving into late summer, the Index sees a rise again in August (9) and September (12), emphasizing the need for sustained sun protection. Residents and visitors are advised to stay informed, use sunscreen, wear protective clothing, and seek shade during peak sun hours, especially in the extreme UV 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 |
Piraju | 15 | 15 | 13 | 11 | 8 | 6 | 7 | 9 | 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 |