Last updated: August 1, 2025
In El Olmo (Rancho Nuevo del Castillo), understanding the UV Index is crucial for maintaining skin health and preventing sunburn, especially in a climate that can expose residents and visitors to intense sunlight. With UV levels soaring to a peak of 13 around midday, awareness of these levels helps ensure you take the necessary precautions to avoid harmful effects of ultraviolet radiation. As part of the Aw climate zone, the region experiences significant UV exposure risks, particularly from late morning to early afternoon. By staying informed about the UV Index, you can enjoy the beautiful outdoors while protecting yourself from sun damage.
As the sun rises at 07:00, the UV Index starts off at a safe level of 1, gradually climbing to 2 by 09:00. But as the clock strikes 10:00, the intensity ramps up significantly, reaching 5. The UV Index peaks at a scorching 13 between 13:00 and 14:00, signaling the most hazardous hours of the day. Afterward, it begins to taper off, dipping to 5 by 17:00, before winding down to 3 at 18:00 and finally returning to a minimal 1 by 19:00. To keep your skin safe during those midday hours, it's essential to take precautionary measures when enjoying the outdoors!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 13 | 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, the UV Index experiences notable fluctuations, with high-risk months primarily occurring from February to October. March through September peak at an extreme UV Index of 13, requiring only 10 minutes of sun exposure before risking sunburn, while January and December are considered high with a UV Index of 7, allowing 25 minutes before burning. As the UV Index generally increases from a high of 9 in February to 13 in the summer months, and then gradually declines to 8 in November, it is crucial for visitors and residents to take preventive measures during the high and extreme categories. This includes wearing protective clothing, applying broad-spectrum sunscreen frequently, and seeking shade during peak sunlight hours, especially between February and October when the risk is significantly heightened.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| El Olmo (Rancho Nuevo del Castillo) | 7 | 9 | 12 | 13 | 13 | 13 | 13 | 13 | 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 |