Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Sao Jose do Rio Preto, Brazil, especially as this city enjoys a warm tropical climate. With UV levels reaching up to 8 during midday hours, awareness of these levels can significantly aid in sunburn prevention and long-term skin health. By monitoring the UV Index, you can take proactive measures to safeguard your skin from harmful rays, ensuring that your outdoor activities remain enjoyable and safe. Whether you’re soaking up the sun’s rays or exploring the vibrant local culture, knowing the daily UV risks can help you protect yourself effectively.
The UV Index is a crucial indicator of sun exposure throughout the day. Early morning hours see a gentle rise, with values peaking at 1 from 7:00 to 8:00 AM. As the sun climbs higher, the intensity elevates significantly; by 10:00 AM, the index jumps to 5, reaching a maximum of 8 between 11:00 AM and 1:00 PM—the perfect time for sunscreen application. As afternoon approaches, conditions begin to moderate, with a gradual decline to 6 at 2:00 PM, followed by further decreases to 4 at 3:00 PM and 2 at 4:00 PM. By 5:00 PM, the UV index drops to 1 and eventually reaches 0 by 6:00 PM, signaling the end of peak sun exposure. Staying aware of these fluctuations is essential for safe outdoor activities!
| 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 | 8 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | 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 |
| Sao Jose do Rio Preto | 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 |