Last updated: July 2, 2025
In San Antonio, Mexico, staying aware of the UV Index is crucial for safeguarding your skin and overall health. With a climate classified as BSk, residents and visitors alike need to understand the significant risks posed by increased UV levels, especially during the peak hours of sunlight. From the late morning through early afternoon, the UV Index soars to dangerous levels, reaching highs of 11 to 14, which can lead to painful sunburns and long-term skin damage if precautions aren’t taken. By keeping an eye on the UV index, you can enjoy the vibrant sun-drenched days while protecting your skin’s health from harmful rays.
As the sun rises, the UV Index begins to climb steadily, starting from a gentle 0 at 7:00 AM before reaching a modest 1 by 8:00 AM. By 9:00 AM, it picks up pace, hitting 2, and then escalates dramatically through the late morning. At 10:00 AM, the index spikes to 5, soon soaring to a peak of 14 from 1:00 PM to 2:00 PM, marking the day’s most intense exposure. The afternoon witnesses a gradual decline, settling at 10 by 4:00 PM and tapering off to a more manageable 3 by 6:00 PM. As the sun begins to set, the UV intensity eases into the evening, leaving behind a trace of 1 at 7:00 PM. Stay protected, especially during the peak hours, and enjoy the sunshine responsibly!
| 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 | 13 | extreme | 10 min |
| 16:00 | 10 | 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 demonstrates significant seasonal changes, peaking during the late spring and summer months. From January to March, the index starts high but quickly escalates, reaching its maximum of 15 in both April and May. The months of February to October pose the highest risk, with an extreme exposure category, where the burn time is notably short at 10 minutes. Visitors and residents should be particularly vigilant during these high-risk months, especially from February to October, and adopt protective measures such as wearing sunscreen, hats, and protective clothing. As we approach the fall and winter months, the UV risk decreases but remains notably high in November and December. It is essential to stay informed and protect your skin year-round.
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 Antonio | 9 | 11 | 14 | 15 | 15 | 14 | 14 | 14 | 14 | 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 |