Last updated: August 1, 2025
Understanding the UV Index in Frederico Westphalen, Brazil, is crucial for maintaining healthy skin and preventing sunburn. With our predominantly Cfa climate, characterized by humid subtropical weather, residents and visitors alike need to be aware of their exposure to ultraviolet radiation, particularly between 10 AM and 2 PM when the UV levels peak at 6—signaling a higher risk for skin damage. By keeping an eye on the UV Index, you can make informed decisions about sun protection, ensuring your outdoor activities remain safe and enjoyable in this vibrant region.
The UV Index throughout the day presents a clear picture of sun exposure levels. Starting at a maximum of 0 at 7:00 AM, the index gradually climbs, reaching 1 by 8:00 AM. By 9:00 AM, it hits 2, and from 10:00 AM to 11:00 AM, it steadily rises to 4. The peak UV intensity occurs at 12:00 PM and 1:00 PM, both registering a high of 6, highlighting the importance of sun protection during these hours. As the afternoon transitions, the index begins to decline, dropping to 5 at 2:00 PM, and further down to 3 by 3:00 PM. The sun’s intensity continues to diminish, with values of 2 and 1 noted at 4:00 PM and 5:00 PM, respectively, before tapering off to 0 by 6:00 PM and remaining at 0 through 7:00 PM. This data underscores the significance of planning outdoor activities with regard to UV exposure, 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 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | high | 25 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 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, seasonal UV changes present varying risks for sun exposure, with the highest UV Index recorded during the winter months. From January to March, the UV Index remains at an extreme level (15–13) with a critical burn time of just 10 minutes, making this period particularly hazardous for unprotected skin. As the year progresses, April sees a decrease to a very high category (UV Index 10, burn time 15 min), followed by a moderate level in June (UV Index 5, burn time 30 min). However, the risk escalates again in late summer and early fall, with August and September reaching very high levels of UV exposure once more. The final months of the year return to extreme conditions (UV Index 14), emphasizing the importance of sun protection year-round. Visitors and residents should take precautions especially during high-risk months of January to March, October, and November, by wearing sunscreen, protective clothing, and sunglasses, and seeking shade during peak hours to ward off the harmful effects of UV radiation.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frederico Westphalen | 15 | 14 | 13 | 10 | 7 | 5 | 6 | 8 | 10 | 13 | 14 | 14 |
| 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 |
| 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 |