Last updated: May 3, 2025
In San Isidro (Los Hoyos), awareness of the UV Index is crucial for maintaining skin health and preventing sunburn, especially in this semi-arid climate. As daily UV levels can soar—peaking at a striking 13 between noon and 1 PM—understanding these fluctuations allows residents and visitors to take proactive measures. With such intense sun exposure, being informed about the UV Index not only helps in planning outdoor activities but also plays a vital role in protecting one's skin from the harmful effects of ultraviolet radiation. Stay safe under the sun by keeping a close eye on the daily UV forecast!
As the day unfolds, the UV Index ramps up significantly, peaking during the midday hours. At 07:00, it starts at a gentle 1, barely warranting concern. By 09:00, it rises to 4, signaling a gradual increase in sun intensity. However, it’s at 11:00 that the UV Index surges to a powerful 10, reaching 13 by 12:00 and 13:00, urging everyone to seek shade and slather on sunscreen. The intensity tapers off into the afternoon, dropping to 12 at 14:00, before gradually fading to 10 by 15:00, and then continuing its descent to 4 at 17:00. As the sun sets, the UV Index recedes to a safe 2 at 18:00 and finally retreats back to 1 by 19:00. It's a brilliant reminder of how vital it is to stay sun-safe during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index exhibits significant seasonal changes, with the highest values recorded from March to September, indicating months of extreme exposure. Specifically, March through August all register a UV Index of 13, while September is slightly lower at 12. The high-risk months for sun exposure are February through October, particularly noting March to July as critical periods due to their extreme exposure category and a burn time of just 10 minutes. Residents and visitors should take precautions during these months by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly to reduce the risk of sunburn and long-term skin damage. In contrast, January and December have a 6 UV Index, while November and October see a decline to 8 and 10 respectively, indicating some respite from the sun's intensity.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| San Isidro (Los Hoyos) | 6 | 9 | 11 | 13 | 13 | 13 | 13 | 13 | 12 | 10 | 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 |