Last updated: May 3, 2025
Awareness of the UV Index in Blumenau, Brazil, is crucial for safeguarding your skin against harmful ultraviolet rays. Understanding UV levels helps in preventing sunburn and promoting long-term skin health, making it essential for anyone who enjoys the outdoors. With a Cfa climate, Blumenau experiences varying UV exposure throughout the day, peaking at a risk level of 7 around noon. As you plan your outdoor activities, staying informed about the UV Index can ensure that you take the proper precautions to protect yourself under the sun.
The UV Index data for the day reveals a notable peak around noon, reaching a maximum of 7, indicating a high level of sun exposure. The morning begins with a mild index, starting at 1 at 07:00 and 08:00. By 09:00, it rises to 2, slowly climbing to 4 by 10:00. The intensity escalates significantly by 11:00 and hits its zenith at 12:00. After that, the UV levels gradually decline, dropping to 6 at 13:00 and 5 at 14:00, before falling to 3 by 15:00. As the evening approaches, the UV Index decreases rapidly, returning to 1 by 16:00 and reaching 0 by 18:00, signaling an end to the sun's harmful rays for the day. Remember to stay protected during those peak hours!
| 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 | 7 | 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 experiences significant fluctuations throughout the year, with the highest levels occurring during the winter months of January, February, and March, where it reaches an extreme rating of 15 and a quick burn time of just 10 minutes. As the seasons change, April sees a slight decrease to 10 (very high), while May and June drop further to 7 and 6, both categorized as high, allowing for longer exposure times of 25 minutes. However, August sees an uptick to 8, returning to a very high level, before reverting to extreme conditions again in September (UV Index 11) and October (13). November and December mirror the start of the year with extreme values of 14 and 15, respectively. Visitors and residents alike should be particularly cautious during high-risk months (January, February, March, September, October, November, and December), limiting sun exposure to prevent harmful effects. Utilizing protective clothing, sunglasses, and sunscreen is strongly advised, especially during peak UV hours to maintain skin health.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blumenau | 15 | 14 | 12 | 10 | 7 | 6 | 6 | 8 | 11 | 13 | 14 | 15 |
| 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 |