Last updated: July 2, 2025
Understanding the UV Index in San Juan del Río, Mexico is crucial for everyone who enjoys the warm, sunny climate of this vibrant region. With UV levels reaching a peak of 13 during midday, awareness of the UV Index can help you take proactive steps to prevent sunburn and safeguard your skin's health. The Aw climate ensures plenty of sunshine throughout the year, making it essential to recognize the risks associated with prolonged sun exposure. By staying informed about the UV levels, you can enjoy the outdoor pleasures of San Juan del Río while effectively protecting yourself from harmful UV radiation.
The UV Index throughout the day offers a fascinating insight into sun exposure levels. Starting at a low point of 0 at 7:00 AM, it gradually rises, marking 1 by 8:00 AM and reaching a moderate 2 by 9:00 AM. As the sun climbs higher, the intensity peaks dramatically at 12:00 PM with an alarming 11, shortly followed by 13 from 1:00 PM to 2:00 PM, indicating a high risk of harm from unprotected sun exposure. The value then begins a steady decline, dropping to 12 at 3:00 PM, followed by a cooling 9 at 4:00 PM. By 5:00 PM, it retreats to 5, and as daylight wanes, it settles back into the low category with a 2 at 6:00 PM and finally 1 at 7:00 PM. For anyone planning outdoor activities, it’s crucial to take precautions during the peak hours, especially between 11 AM and 2 PM!
| 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 | 12 | extreme | 10 min |
| 16:00 | 9 | 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, ultraviolet (UV) exposure varies significantly, with high-risk months identified primarily from February to October. During this period, the UV Index consistently falls within the extreme category, peaking at 14 in May, June, and September, indicating a burn time of just 10 minutes. In contrast, January, November, and December see very high UV levels, with longer burn times of 15 minutes. It is crucial for both visitors and residents to practice sun safety during these months by wearing appropriate sunscreen, hats, and protective clothing, and seeking shade during peak sunlight hours. Being aware of these seasonal changes can significantly reduce the risk of skin damage and related health issues.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Guadalajara UVI | 9 | 11 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 9 | 8 |
| San Juan del Rio | 10 | 11 | 13 | 13 | 14 | 14 | 13 | 13 | 14 | 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 |