Last updated: July 2, 2025
In San Francisco Atotonilco, Mexico, understanding the UV Index is crucial for protecting your skin and overall health. The UV Index measures the intensity of ultraviolet radiation from the sun, helping residents and visitors gauge the risk of sunburn and long-term skin damage throughout the day. With a Cfb climate, known for its mild weather, San Francisco Atotonilco often sees peak UV levels reaching as high as 14 around midday. Being aware of these levels not only ensures you enjoy the sun safely but also empowers you to take necessary precautions during the hours of highest exposure, typically between 10 AM and 4 PM. Stay informed and keep your skin safe!
As the sun rises, the UV Index starts at a gentle 1 at 7:00 AM, indicating minimal sun exposure risk. By 9:00 AM, it climbs to 2, showcasing the gradual intensification of sunlight. The peak arrives at 12:00 PM with a striking 12, signaling a high risk of harm from unprotected sun exposure. This intensity continues through 1:00 PM and 2:00 PM, where it reaches its maximum of 14—a reminder to seek shade and apply sunscreen. As the afternoon progresses, the UV Index begins to taper off, dropping to 9 at 4:00 PM, and ending the day at a safer 1 by 7:00 PM. Stay sun-smart, especially during the peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 14 | extreme | 10 min |
| 14:00 | 14 | 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, the UV Index demonstrates significant seasonal fluctuations, with the highest values occurring from February to October, indicating an extreme exposure category and a burn time of just 10 minutes. Specifically, March to August records the peak UV Index of 14, suggesting these are critical months for sun safety. Conversely, January, November, and December offer lower UV levels in the very high exposure category, allowing for a more extended burn time of 15 minutes. Visitors and residents are strongly advised to take precautions during high-risk months—primarily from February to October—by wearing protective clothing, applying sunscreen, and seeking shade during peak sun hours to reduce the risk of harmful UV exposure.
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 |
| San Francisco Atotonilco | 8 | 11 | 13 | 14 | 14 | 14 | 14 | 14 | 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 |