Last updated: July 2, 2025
In Tenasda (Barrio de San Ildefonso), Mexico, awareness of the UV Index is essential for protecting your skin and overall health. Understanding UV levels can help you prevent sunburn and reduce the risk of long-term skin damage, especially in a region where high UV exposure is common. With a Cwb climate that features plenty of sunshine, the UV Index can soar to dangerous levels—reaching a peak of 14 around midday. Make it a habit to check the UV Index daily and take necessary precautions, ensuring that your time outdoors remains enjoyable and safe.
As the sun rises, the UV Index gradually climbs, starting at 0 at 7:00 AM—a safe time for outdoor activities. By 9:00 AM, it reaches 2, indicating a mild risk. However, as the day progresses, the intensity peaks at 12:00 PM with a high of 11, and again at 1:00 PM and 2:00 PM, both hitting an alarming 14. This represents a very high risk of harm from unprotected sun exposure, urging caution for those outdoors. The afternoon sees a slight drop, with the index falling to 9 at 4:00 PM and tapering off as the sun begins to set, closing out the day at 1 by 7:00 PM. Remember to stay protected during those peak hours!
| 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 | 5 | moderate | 30 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 14 | extreme | 10 min |
| 14:00 | 14 | extreme | 10 min |
| 15:00 | 12 | 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 |
Throughout the year, the UV Index exhibits notable seasonal changes, peaking from March to September when it reaches extreme levels of 14 to 15. The highest risk months for UV exposure are March, April, May, June, and July, where the UV Index consistently registers at 15, meaning skin can burn in as little as 10 minutes. In contrast, during the months of January, February, November, and December, the risk is still significant with high to very high UV Index levels, but the burn time increases to 15 minutes. Visitors and residents are strongly advised to take precautions, especially during the high-risk months, by wearing protective clothing, sunscreen, and seeking shade to minimize long-term skin damage. Stay informed and protective year-round to ensure safety against harmful UV radiation.
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 |
| Tenasda (Barrio de San Ildefonso) | 10 | 12 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 12 | 10 | 8 |
| Puebla UVI | 10 | 12 | 14 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 10 | 9 |