Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors of Union, Guatemala, given its unique climate and elevation that can significantly elevate UV exposure. With UV levels peaking at a staggering 14 around noon, being aware of these fluctuations can help effectively prevent sunburn and promote long-term skin health. In a region characterized by a Cwb climate—marked by mild, pleasant temperatures yet considerable sun intensity—it's essential to stay informed. Protecting your skin from harmful UV rays not only ensures comfort during outdoor activities but also safeguards against the long-term effects of sun damage. Remember, knowledge is your best defense against the sun!
As the sun ascends in the morning sky, the UV Index steadily climbs from a gentle 2 at 07:00 to a striking 14 by 12:00, marking the peak intensity of ultraviolet radiation. The midday hours are crucial; at 10:00, the index reaches 11, indicating a high risk of harm from unprotected sun exposure. Even as it wanes to 10 at 14:00, caution is still advised as basking in direct sunlight during these hours can lead to skin damage. As the afternoon progresses, the numbers begin to drop significantly, with a relief 4 at 16:00, and fading to 1 by 17:00. By the time the sun sets, the risk diminishes to 0, inviting a comfortable and safe evening. It's essential to stay protected, especially during the height of the day!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 11 | extreme | 10 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
During the year, UV Index levels indicate a significant fluctuation in UV exposure, with high-risk months clearly spanning from January to October, where the index ranges from 11 to 15, categorized as extreme exposure with a burn time of just 10 minutes. April, May, and July are particularly noteworthy, consistently hitting a peak index of 15. As we transition to November, the index decreases to 11, and by December, it drops to 9, signifying a shift to very high exposure with a slightly longer burn time of 15 minutes. Visitors and residents are strongly encouraged to take precautionary measures, including wearing protective clothing, applying sunscreen, and limiting sun exposure during these high-risk months to mitigate the dangers of prolonged UV exposure.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Petapa UVI | 11 | 13 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 10 | 10 |
| Villa Nueva UVI | 11 | 13 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 10 | 10 |
| Mixco UVI | 11 | 13 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 11 | 10 |
| Guatemala City UVI | 11 | 13 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 11 | 10 |
| Union | 11 | 13 | 14 | 15 | 15 | 14 | 15 | 14 | 14 | 13 | 11 | 9 |
| San Juan Sacatepequez UVI | 11 | 13 | 15 | 15 | 14 | 14 | 15 | 14 | 14 | 13 | 11 | 10 |