Last updated: July 2, 2025
Understanding the UV Index is crucial for anyone living in or visiting Buenos Aires (San Isidro), as it serves as an essential guide to sun safety. Awareness of UV levels can significantly aid in preventing sunburn and protecting skin health, especially during the peak hours of sunlight. In this region, which enjoys a warm climate, the UV Index can soar to dangerous levels—reaching 12 between noon and 2 PM. This means that even short exposure during these hours can lead to harmful effects. Stay informed to enjoy the sunny days safely while safeguarding your skin from potential damage!
The UV Index provides crucial insight into sun exposure throughout the day, peaking dramatically during mid-afternoon. Starting gently at 1 from 07:00 to 09:00, it quickly escalates, reaching 5 by 10:00. The heart of the day sees the UV Index soar, peaking at an intense 12 from 13:00 to 14:00, indicating a high risk of harm from unprotected sun exposure. As the sun begins its descent, the UV levels gradually decline, tapering off to 5 by 17:00, and returning to a safer 1 by sunset at 19:00. For anyone planning outdoor activities, it’s essential to seek shade and protect skin 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 | 5 | moderate | 30 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, seasonal UV changes show a significant increase in UV Index values from January to October, peaking in June with an index of 13 classified as extreme. The most high-risk months for UV exposure are from March to October, where the index consistently remains 11 or higher. Specifically, March to July features extreme levels, with burn times as short as 10 minutes during this period. Visitors and residents are strongly advised to take precautions such as wearing protective clothing, applying sunscreen, and seeking shade during peak sun hours, especially from March to September, to mitigate the risks of harmful UV exposure. As the year progresses, both November and December see a decrease in UV levels, but caution should still be exercised with high risk in November.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Buenos Aires (San Isidro) | 7 | 10 | 11 | 12 | 12 | 13 | 12 | 12 | 12 | 11 | 8 | 7 |
| Guadalajara UVI | 9 | 11 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 9 | 8 |
| Iztapalapa UVI | 10 | 12 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 12 | 10 | 8 |
| Ecatepec de Morelos UVI | 10 | 12 | 14 | 15 | 15 | 14 | 14 | 13 | 14 | 12 | 10 | 8 |
| Mexico City UVI | 10 | 12 | 14 | 15 | 15 | 14 | 14 | 13 | 14 | 12 | 10 | 8 |
| Puebla UVI | 10 | 12 | 14 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 10 | 9 |