Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Porto Ferreira, Brazil, where sun exposure can significantly impact skin health. With a Cfa climate, the city experiences warm and humid conditions that can elevate UV levels throughout the day, peaking around noon with a UV Index of 8. This awareness is key to preventing sunburn and long-term skin damage, especially during hours when the index reaches its highest values. By staying informed about UV levels, you can better protect yourself and enjoy the beautiful Brazilian sun safely!
The UV Index throughout the day presents an intriguing pattern of intensity. At 7:00 AM, the index starts at a low 1, indicating minimal risk for most individuals. As the sun rises higher, it gradually climbs to 2 by 8:00 AM and reaches 3 by 9:00 AM. The real surge occurs around 10:00 AM, where it peaks at 6, then soars to a maximum of 8 at 12:00 PM, creating a high-risk situation for unprotected skin. After this midday peak, the index begins to decline, dropping back to 7 at 1:00 PM and down to 6 by 2:00 PM. The afternoon sees a further decrease, with levels falling to 3 at 3:00 PM, before tapering to 1 by 4:00 PM and slipping to 0 as evening approaches at 6:00 PM. With this data, it's clear that midday is the critical time to be mindful of sun exposure!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | high | 25 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 |
The UV Index shows significant seasonal fluctuations, with the highest values typically between January and April, where the index remains in the extreme category (ranging from 15 to 16) and a quick burn time of just 10 minutes. This trend continues into September and October, maintaining extreme levels. May sees a shift to very high (UV Index 8) and a slightly longer burn time of 15 minutes, while June to August presents lower but still concerning values, categorized as high and very high (up to 10), with burn times extending to 25 minutes. November and December revert to extreme levels. Visitors and residents are advised to take necessary precautions during these high-risk months, particularly from January to April and again in September to November, by wearing protective clothing, applying sunscreen frequently, and limiting sun exposure, especially during peak hours.
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 |
| Porto Ferreira | 15 | 16 | 13 | 11 | 8 | 7 | 8 | 10 | 11 | 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 |