Last updated: May 3, 2025
Understanding the UV Index is essential for residents and visitors of San Juan (San Juan de Coyotillos), Mexico, where the strong sun and warm climate create significant exposure risks. Being aware of UV levels not only helps prevent painful sunburns but also plays a critical role in maintaining long-term skin health. In this BSk climate zone, the UV Index frequently reaches dangerous levels, especially during midday hours where values soar to 15—indicating extreme risk of harm from unprotected sun exposure. Equip yourself with this vital information to enjoy the beautiful Mexican sun safely!
The UV Index today presents a vivid picture of solar intensity, starting off gently with a low of 1 at 07:00 and 08:00. As the morning progresses, the index creeps up to 2 by 09:00, but it’s the hours between 10:00 and 14:00 where sun-seekers need to take serious precautions, peaking at an intense 15 at both 13:00 and 14:00. At 12:00, the index hits a scorching 12, indicating it’s crucial to seek shade or apply sunscreen. The afternoon brings a gradual decline, with levels dropping to 9 at 16:00 and 6 at 17:00. The evening cools down the UV exposure once more, returning to a safer 1 by 19:00. Stay sun-smart, especially during those hours of peak intensity!
| 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 | 9 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 15 | extreme | 10 min |
| 14:00 | 15 | extreme | 10 min |
| 15:00 | 13 | extreme | 10 min |
| 16:00 | 9 | very high | 15 min |
| 17:00 | 6 | high | 25 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal fluctuations, with extreme levels peaking from February to September. March and April hold the highest readings at 14 to 15, indicating a burn time of just 10 minutes. Visitors and residents should be particularly cautious during these months as well as in May, when the UV Index reaches its peak. January, November, and December present a slightly lower risk with a very high UV Index of 8 to 10, allowing for slightly longer exposure times of 15 minutes. To protect against severe sun damage, it is strongly advised to use sunscreen, wear protective clothing, and seek shade during peak UV hours, especially in the high-risk months of March through September.
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 (San Juan de Coyotillos) | 8 | 11 | 14 | 14 | 15 | 14 | 14 | 14 | 13 | 12 | 10 | 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 |