Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Bolonchen de Rejon, Mexico, where the tropical climate can lead to high UV exposure throughout the day. Awareness of UV levels helps to prevent sunburn and maintain skin health, especially with peak indices reaching a striking 12-13 around midday. This highlights the need for protective measures, as the sun's rays can be particularly intense in this region. By staying informed about the UV Index, you can enjoy the beautiful outdoors while keeping your skin safe from harmful effects.
At dawn, the UV Index begins its day at a modest 1 at 07:00, signaling a low risk for sun exposure. As the sun climbs higher, the index rises steadily, reaching 2 by 08:00 and 3 at 09:00. The peak occurs around 12:00, where it soars to an impressive 12, indicating a very high risk for harm from unprotected sun exposure. The intensity slightly decreases in the afternoon, with readings of 13 at 13:00 and tapering to 9 by 15:00. As evening approaches, the UV levels drop, returning to 1 by 18:00 and 19:00. It's essential to stay protected during those peak hours from 11:00 to 15:00 when the UV Index is at its highest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index displays significant seasonal variations, with very high to extreme levels peaking from March to October. The highest UV Index is recorded at 13 during March to August, categorizing these months as having an extreme risk of harm from unprotected sun exposure, with a burn time of just 10 minutes. January and February also present a challenge with a very high UV Index of 8 and 10, respectively, where exposure should still be limited to 15 minutes. As the fall months approach—October and November—the UV Index begins to decline but remains at a high to very high level, requiring caution. To protect yourself, particularly during the high-risk months of March through October, it is essential to apply sunscreen, seek shade, and wear protective clothing when outdoors.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bolonchen de Rejon | 8 | 10 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 11 | 9 | 7 |
| 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 |