Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Dieciocho de Marzo, Mexico, where the climate can lead to significant sun exposure year-round. Awareness of UV levels not only helps prevent painful sunburns but also plays a vital role in maintaining long-term skin health. With maximum UV Index readings soaring to 13 during midday hours, the risks increase dramatically, making it essential to stay informed and protected. As you navigate the sunny days typical of this Aw climate zone, knowing when to seek shade or apply sunscreen can make all the difference in safeguarding your skin.
As the day unfolds, the UV Index rises steadily, beginning at a safe 0 at 07:00 and peaking dramatically. By 10:00, it escalates to 4, signaling the need for some sun protection. The intensity reaches 10 at 12:00, and then hits its maximum at 13:00 with a formidable 12. Right after, it slightly dips but remains high at 12 until 15:00. As the afternoon wanes, the UV Index begins to decline, dropping to 9 by 16:00, and continuing its descent to 1 by 19:00. This fluctuation highlights the importance of being sun-smart during peak hours, especially between 11:00 and 15:00, when the sun is at its strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | 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 |
Throughout the year, UV levels fluctuate significantly, with the highest UV Index typically occurring from March to October, peaking at 14 in June. The months of March through October are classified under the extreme exposure category, where the burn time is reduced to only 10 minutes, highlighting a critical need for sun protection during this period. January and February also present very high UV levels, with burn times of 15 minutes, indicating that sun safety should not be overlooked even in the winter months. Visitors and residents alike are strongly advised to take precautions such as wearing sunscreen, protective clothing, and sunglasses, especially from late spring to early fall, when the risk of skin damage is heightened. Staying informed and vigilant about UV exposure can significantly reduce the risk of sun-related health issues.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dieciocho de Marzo | 9 | 10 | 13 | 13 | 13 | 14 | 13 | 13 | 13 | 11 | 9 | 8 |
| 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 |