Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in El Rosario de Arriba, Mexico, where sun exposure can escalate quickly throughout the day. With a typical climate characterized by hot, dry conditions, this picturesque town experiences peak UV levels that can soar to 12 between noon and early afternoon. Being aware of UV levels is essential not only for preventing sunburn but also for protecting your long-term skin health. As you enjoy the sunny days in this beautiful region, make it a habit to check the UV Index and take necessary precautions to ensure that your outdoor adventures remain safe and enjoyable.
The UV Index dramatically rises as the day progresses, peaking in the early afternoon. Starting at a modest 1 at 07:00, the UV exposure quickly increases, reaching 10 by 11:00 and peaking at a dangerous 12 from 12:00 to 13:00. As the sun begins to set, the index gradually declines, falling to 5 by 16:00, and tapering off to a low 1 by 18:00 and 19:00. This ebb and flow underscores the importance of sun safety, especially during those peak hours when the UV Index is at its highest. Stay protected!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, seasonal UV changes reveal a significant increase in UV exposure, peaking during the summer months. From January to February, the UV Index rises from 5 (moderate) to 7 (high), signaling a gradual need for protection. The high-risk months, particularly from March through September, exhibit extreme levels of UV Index, with values reaching 12, where burn time drops to just 10 minutes. April and May maintain this intensity, while August and September remain at 11, still within the extreme category. Visitors and residents should take precautions during these months, including wearing wide-brimmed hats, applying sunscreen with high SPF, and seeking shade, especially between 10 AM and 4 PM. As autumn approaches, UV levels decrease, but attention to sun safety remains important into November. During the winter months of December and January, UV exposure is lower, but it’s still advisable to remain vigilant, especially if snow is present, as it can reflect UV rays.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| El Rosario de Arriba | 5 | 7 | 9 | 11 | 12 | 12 | 12 | 11 | 11 | 8 | 6 | 5 |
| 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 |