Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of San Antonino Castillo Velasco, Mexico, where the sunny, Cwb climate often leads to high levels of ultraviolet radiation. With UV Index values peaking at an intense 15 during midday, awareness of these levels is essential for preventing sunburn and safeguarding your skin's health. Regular exposure to high UV levels can increase the risk of skin damage and long-term health issues, making it important to check the UV Index regularly. Whether you're enjoying outdoor activities or simply soaking up the sun, being informed about UV exposure risks will help you stay protected and enjoy your time in this vibrant locale.
The UV Index starts low in the morning, with values of 1 at both 07:00 and 08:00. As the day unfolds, it ** climbs steadily**, peaking at a striking 15 during the afternoon hours of 13:00 and 14:00. This indicates an intense level of UV radiation, which necessitates taking precautions against sun exposure. By 15:00, the index begins to dip, indicating a gradual decrease in UV intensity, falling to 5 by 17:00. As evening approaches, the index cools down to 2 at 18:00 and returns to a benign 1 by 19:00. This significant rise and fall highlight the importance of monitoring the UV Index, especially during peak hours when outdoor activities can lead to increased risk of sunburn.
| 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 | 9 | very high | 15 min |
| 12:00 | 13 | 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 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index exhibits significant seasonal variation, peaking from March to October when it reaches the extreme category of 15 during most months. The highest risk months are from February to July, where the UV Index consistently remains above 13, with a particularly concerning reading of 15 in March through July. Visitors and residents should exercise caution during these months, limiting sun exposure to 10 minutes or less and utilizing protective measures such as broad-spectrum sunscreen, hats, and sunglasses. As autumn approaches, UV levels gradually decrease, with December and January offering some relief, but even then, a UV Index of 10 indicates that caution is still advised. Stay informed and prioritize sun safety to minimize health risks throughout the year.
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 Antonino Castillo Velasco | 10 | 13 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 11 | 9 |