Last updated: May 3, 2025
Staying informed about the UV Index is crucial for residents and visitors in San Juan del Río, Mexico, where the Cwb climate offers a mix of sun and occasional rain. Understanding the UV levels throughout the day can help prevent sunburn and protect skin health, especially when peak readings soar to a staggering 15 between 1:00 PM and 2:00 PM. This awareness is vital not just for outdoor enthusiasts but for everyone, as the intense sunlight can pose significant risks to skin health. With its high altitude and proximity to the equator, San Juan del Río presents unique challenges regarding UV exposure, making proactive sun protection essential for enjoying the area's natural beauty safely.
The UV Index throughout the day showcases a dynamic shift in sun intensity. Starting gently at 1 during the early hours, it quickly climbs to 3 by 09:00. As the sun reaches its peak, the index escalates dramatically to a striking 14 by 12:00, signaling a high risk of harm from unprotected sun exposure. The apex arrives at 15 between 13:00 and 14:00, urging caution for anyone outdoors. Gradually, as the afternoon fades, the index dips to 12 at 15:00, then further descends to 2 by 18:00, finally settling back at 1 by 19:00. It’s a vivid reminder of the day's sun's power, with the highest risks occurring in the early afternoon. Stay protected and enjoy the sun safely!
| 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 | 6 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 15 | extreme | 10 min |
| 14:00 | 15 | extreme | 10 min |
| 15:00 | 12 | 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 |
The UV Index exhibits a notable seasonal pattern, peaking during the warmer months from March to October, where values consistently remain in the extreme category (UV Index 14-15). The highest UV levels are recorded in April, May, June, and July, maintaining an extreme classification and a very short burn time of just 10 minutes. In contrast, January and December experience very high UV levels but with slightly longer burn times of 15 minutes. Based on this data, the high-risk months for UV exposure are clearly March through November, especially from April to August. Visitors and residents are advised to take precautionary measures during these months—such as wearing sunscreen, protective clothing, and seeking shade during peak hours—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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| San Juan del Rio | 10 | 13 | 14 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 11 | 9 |