Last updated: July 2, 2025
In the picturesque region of Ribera la Unión (Castaño), Mexico, being aware of the UV Index is crucial for protecting your skin during outdoor activities. With the area's Cwb climate, sunny days can quickly escalate into high UV exposure, leading to sunburn and long-term skin health issues. This is especially important as UV levels can peak at a staggering 15 between 1 PM and 2 PM, highlighting the need for vigilance. Understanding these fluctuations empowers residents and visitors alike to take necessary precautions, ensuring safe and enjoyable experiences under the Mexican sun.
The UV Index today starts off relatively low, peaking at 1 between 7:00 and 8:00 AM, making it a safe time for morning strolls. As the sun rises higher in the sky, from 9:00 AM onward, the intensity ramps up, reaching a notable 6 by 10:00 AM. By noon, the index skyrockets to 13, indicating a high risk of harm from unprotected sun exposure. The sun's intensity reaches its zenith at 1:00 PM with a UV Index of 15, before gradually tapering off to 11 by 3:00 PM. As the afternoon wanes, the index declines steadily, dropping to 4 by 5:00 PM, and returns to a comfortable 1 by 7:00 PM. It’s wise to seek shade and wear protective clothing during the midday peak to safeguard your skin from harmful UV rays!
| 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 | 10 | very high | 15 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 15 | extreme | 10 min |
| 14:00 | 14 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 8 | very high | 15 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Seasonal changes in the UV Index highlight significant risks for both visitors and residents, particularly from February to October, when the UV Index reaches extreme levels. The highest risk occurs in July, with an index of 15, demanding protective measures within just 10 minutes of sun exposure. Conversely, January, November, and December show lower UV levels, classified as very high, with burn times of 15 minutes. To minimize the risk of skin damage, it is crucial during high-risk months to seek shade, wear protective clothing, and apply sunscreen frequently, especially during midday hours when the sun is at its peak intensity. Stay vigilant, and prioritize health alongside outdoor activities!
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 |
| Ribera la Union (Castano) | 10 | 12 | 14 | 14 | 14 | 14 | 15 | 13 | 13 | 12 | 10 | 9 |
| 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 |