Last updated: June 2, 2025
In San Francisco de Horizonte, Mexico, being aware of the UV Index is crucial for safeguarding your skin and overall health. Understanding UV levels not only helps in preventing sunburn, but also plays a vital role in reducing the risk of long-term skin damage. With a BWh climate characterized by hot, dry conditions, residents and visitors often face significant UV exposure, especially during the midday hours when the index peaks at 12 and 13. Staying informed about daily UV levels allows you to enjoy the sun while protecting your skin from its potentially harmful effects.
This hour-by-hour UV Index data reveals a striking pattern throughout the day. Starting off gently at 1 at 07:00 and 08:00, the intensity begins to rise gradually, reaching 2 by 09:00. The sun's rays become increasingly potent as the clock ticks, hitting 4 at 10:00 before skyrocketing to 7 at 11:00. The peak occurs in the early afternoon, with a scorching 10 at 12:00 and reaching an intense 13 at 14:00. Following this zenith, the UV Index begins to taper off, descending to 12 by 15:00, then dropping to 9 at 16:00. As the day cools, the UVI continues to decline, finding itself at 3 by 18:00 and returning to a more manageable 1 at 19:00. In summary, the UV exposure is highest between 11:00 and 14:00, making those hours critical for sun safety.
| 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 | 12 | extreme | 10 min |
| 14:00 | 13 | 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 |
The UV Index shows a significant increase in UV radiation as the year progresses, with high-risk months primarily occurring from February to October, where the index reaches extreme levels of 12 to 14. March through October consistently presents dangers of severe sunburn within just 10 minutes of exposure. In contrast, January, November, and December maintain a high or very high risk but allow for longer burn times of 15 to 25 minutes. To ensure safety, both visitors and residents are strongly advised to wear adequate sun protection, including sunscreen, hats, and UV-protective clothing, particularly during these peak months to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| San Francisco de Horizonte (Horizonte) | 7 | 10 | 12 | 14 | 14 | 13 | 13 | 13 | 13 | 11 | 8 | 6 |
| 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 |