Last updated: July 2, 2025
Understanding the UV Index is essential for residents and visitors of Villa Union, Mexico, where the sun shines brightly, especially in the BSh climate zone. Knowledge of UV levels is crucial for preventing sunburn and safeguarding skin health, as exposure can lead to short-term discomfort as well as long-term skin issues. With peak UV Index values reaching 12 around midday, being aware of these levels can help you enjoy outdoor activities safely while minimizing the risk of harmful effects from ultraviolet radiation. Stay informed, stay protected, and soak up the sun responsibly!
Throughout the day, the UV Index experiences a remarkable ascent and subsequent descent, reflecting the sun's peak intensity. Starting at a gentle 1 in the early hours of 07:00 and 08:00, the index gradually climbs to reach a moderate level of 2 by 09:00. However, it escalates dramatically at 10:00, spiking to 4, and by 11:00, the sun's rays are striking with a powerful force, resulting in a significant 7. The apex occurs at 12:00, hitting a striking 10, and shortly after, it peaks at 11 by 13:00 before achieving its highest mark of 12 at 14:00. As the afternoon progresses, there’s a noticeable decrease, with the index descending to 11 at 15:00, and continuing to decline to 5 by 17:00. By evening, it gently tapers off to 3 at 18:00 and finishes the day at a comfortable 1 by 19:00. With such fluctuations, it’s essential to stay protected during the midday hours when the sun is at its strongest!
| 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 | 4 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index reveals notable seasonal changes in sun exposure risk. High-risk months typically span from February to September, with March through August showing extreme UV levels of 11 to 12, where the burn time significantly decreases to just 10 minutes. In particular, April, May, June, July, and August are critical, maintaining this extreme classification. Visitors and residents are urged to take necessary precautions during these months, such as wearing protective clothing, using broad-spectrum sunscreen, and seeking shade, especially during midday hours. As the year progresses, UV levels taper off, with November showing a high index of 7 and December reducing to a moderate 5, allowing for safer sun exposure conditions.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Villa Union | 6 | 8 | 9 | 11 | 11 | 12 | 12 | 12 | 11 | 9 | 7 | 5 |
| 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 |