Last updated: June 2, 2025
Understanding the UV Index is crucial for the residents of Arroio dos Ratos, Brazil, as it serves as a vital tool for sun safety awareness. With its Cfa climate, Arroio dos Ratos experiences various UV exposure levels throughout the day, especially peaking around midday when the index reaches 4. By monitoring these levels, you can protect yourself from harmful sunburns and promote better skin health. Whether you're enjoying outdoor activities or just soaking up some sun, being informed about UV levels can significantly reduce risks and keep your skin healthy all year round.
The UV Index throughout the day experiences a notable progression, starting from a maximum of 0 at 07:00, indicating minimal UV exposure. As the morning unfolds, it gradually rises, reaching 1 by 08:00 and staying steady at this level until 09:00. The sun’s intensity escalates sharply, peaking at 4 between 11:00 and 13:00, highlighting the importance of sun protection during these hours. Just after peak exposure, the index dips slightly to 3 at 14:00 before decreasing further to 2 by 15:00. The final hours see a steady decline, falling back to 1 at 16:00 and 17:00, before returning to 0 by 18:00, signaling the end of the day. This data emphasizes the need for awareness and protection during midday hours when UV radiation is at its highest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 3 | moderate | 30 min |
| 11:00 | 4 | moderate | 30 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 4 | moderate | 30 min |
| 14:00 | 3 | moderate | 30 min |
| 15:00 | 2 | low | 45 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 |
Throughout the year, seasonal UV changes show extreme levels from January to March, with a UV Index peaking at 14 during these months and a rapid burn time of just 10 minutes. As spring progresses, April sees a decrease to a UV Index of 9, indicating a very high exposure category, with burn times extending to 15 minutes. By May, the UV Index drops to 6 (high), where residents can spend up to 25 minutes in the sun without burning. The summer months of June and July bring about a moderate UV Index of 4 and 5 respectively, allowing for 30 minutes of sun exposure before a burn occurs. However, from August to October, a rise to high and extreme levels returns, urging caution with burn times shrinking back down to 15-10 minutes in September and October. November and December again reflect extreme conditions, with Ultraviolet exposure remaining a concern. Visitors and residents are strongly advised to employ sun protection measures—such as wearing sunscreen, hats, and protective clothing—especially during the high-risk winter and early spring months, to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arroio dos Ratos | 14 | 13 | 12 | 9 | 6 | 4 | 5 | 7 | 9 | 12 | 13 | 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 |