Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Joanopolis, Brazil, where the climate is predominantly Cfa, characterized by warm summers and mild winters. Being aware of UV levels helps prevent sunburn and promotes skin health, allowing you to enjoy the beautiful outdoor landscapes without risking damage. In Joanopolis, the UV Index can reach peaks of 7 around midday, indicating the need for protection during those hours. With this knowledge, you can better safeguard yourself against harmful UV exposure and fully embrace the sun-soaked adventures this enchanting town has to offer.
The UV index for the day shows a gradual increase in intensity, peaking at 12:00 PM with a notably high value of 7. Starting the morning with a mild index of 1 at 07:00 AM and 08:00 AM, the UV levels began to rise significantly by 09:00 AM, reaching 3. It escalated further to 4 by 10:00 AM, and by 11:00 AM, the index hit 6, indicating a need for sun protection. The most intense UV exposure occurs at 12:00 PM, where the index reaches its maximum at 7 before starting to decline in the afternoon. Post 1:00 PM, the values dropped to 6, then fell to 4 at 02:00 PM, and continued retreating to 3 by 03:00 PM. As the sun sets, the UV index returns to 1 by 04:00 PM and winds down to 0 in the evening hours, from 06:00 PM onwards. Stay safe and enjoy the sunshine, but remember to take precautions during 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 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 4 | 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 shows significant seasonal variation, with the highest readings occurring from January to April, where the index reaches an extreme 16. These months pose a high risk for sunburn, with a critical 10-minute burn time. After April, the index slightly decreases, but remains very high in May (8) and July (8), and high in June (7). As summer transitions into fall, the UV Index fluctuates but remains concerning, especially in September (12) and October (14), both categorized as extreme, again allowing only a short 10-minute exposure without protection. The end of the year is marked by high indices once more, peaking in December at 16. Visitors and residents are strongly advised to take protective measures against UV exposure, particularly during these high-risk months to minimize the risk of sunburn and long-term skin damage.
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 |
| Joanopolis | 16 | 16 | 13 | 11 | 8 | 7 | 8 | 10 | 12 | 14 | 15 | 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 |