Last updated: July 2, 2025
Understanding the UV Index in Rio Claro, Brazil is crucial for maintaining skin health and preventing sunburn, especially in its Cfa climate, characterized by warm summers and moderate sunlight. With UV levels peaking at 7 during midday, it's essential for residents and visitors to stay informed about daily UV exposure risks. By recognizing the significance of these levels, you can take proactive measures to protect your skin and enjoy the sun safely. Whether you're spending time outdoors or planning activities, knowledge of the UV Index will help you make informed choices for a healthier lifestyle in Rio Claro.
As the sun rises, the UV Index remains low at 1 from 07:00 to 08:00, making it a perfect time for early risers. However, by 09:00, the index climbs to 3, signaling that afternoon activities should be planned cautiously. The peak intensity occurs between 11:00 and 13:00, reaching a maximum of 7, suggesting that sun protection is essential during these hours. Afternoon hours witness a gradual decline as the index dips to 5 at 14:00, followed by a further decrease to 3 by 15:00. As the day winds down, the UV exposure diminishes significantly to 2 at 16:00 and drops to 1 by 17:00, before falling to 0 by 18:00, signaling a safe end to sun exposure for the day. Stay savvy and protect your skin, especially during those peak hours!
| 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 | 7 | high | 25 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 5 | moderate | 30 min |
| 15:00 | 3 | 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 |
Throughout the year, the UV Index shows significant seasonal changes, with high-risk months primarily falling between January and April, where the UV Index remains at an extreme level of 16 to 11 and the burn time is limited to just 10 minutes. This level of risk returns in September through November, where the index spikes again to numbers as high as 14 for November. May introduces a decrease to a very high category with an index of 8, followed by June and July, which stabilize at a high level with an increased burn time of 25 minutes. By August, there's a resurgence to very high, so caution is advised. Therefore, visitors and residents should prioritize sun safety by seeking shade, wearing protective clothing, and applying sunscreen, especially during the months of January to April and September to November when the risk of UV exposure is greatest.
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 |
| Rio Claro | 16 | 16 | 13 | 11 | 8 | 6 | 7 | 10 | 12 | 13 | 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 |