Last updated: May 2, 2026
Understanding the UV Index is crucial for residents of San Francisco Tlalcilalcalpan, Mexico, as it plays a significant role in protecting skin health and preventing sunburn. With high UV levels, especially during midday, being aware of these fluctuations can help you make informed decisions about outdoor activities and sun protection. The climate in San Francisco Tlalcilalcalpan, characterized as Cwb, brings unique challenges with varying UV exposure risks throughout the day. By keeping an eye on the UV Index, you can safeguard your skin and enjoy the beautiful, sunny days that this region has to offer!
The UV Index for the day showcases a dramatic rise in intensity as the sun climbs higher in the sky. Starting from a calm 0 at 07:00, it gradually ticks upward, reaching 1 by 08:00. As the clock strikes 10:00, the UV Index surges to 5, and by 11:00, it climbs to a robust 9. The peak occurs at 13:00 and 14:00, where it hits a thrilling 14—a clear warning for sun protection. As the afternoon wanes, the intensity begins to drop, falling to 9 by 16:00, and further down to 5 at 17:00. The day wraps up with a gentle decline, ending with a low 1 by 19:00. As such, it’s essential to stay vigilant during the peak hours, particularly between 11:00 and 14:00, to enjoy the sun safely!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 60+ minutes |
| 08:00 | 1 | low | 60+ minutes |
| 09:00 | 3 | moderate | 30–60 min |
| 10:00 | 6 | high | 15–30 min |
| 11:00 | 10 | very high | 10–15 min |
| 12:00 | 13 | extreme | <10 minutes |
| 13:00 | 15 | extreme | <10 minutes |
| 14:00 | 15 | extreme | <10 minutes |
| 15:00 | 13 | extreme | <10 minutes |
| 16:00 | 9 | very high | 10–15 min |
| 17:00 | 5 | moderate | 30–60 min |
| 18:00 | 2 | low | 60+ minutes |
| 19:00 | 1 | low | 60+ minutes |
Throughout the year, the UV Index demonstrates significant seasonal changes, peaking between March and September with values consistently classified as extreme (UV Index 15) and requiring minimal exposure for skin protection. The highest risk months are March, April, May, and September, where the UV Index reaches 15, indicating a burn time of just 10 minutes. Even in January and November, the UV Index remains high at 10, requiring careful sun exposure management. Visitors and residents are advised to take precautions during these high-risk months by wearing sunscreen, protective clothing, and seeking shade to minimize the risk of skin damage. Remember, even on cloudy days, UV radiation can still be intense, so staying vigilant is key.
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 |
| 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 |
| San Francisco Tlalcilalcalpan | 10 | 12 | 15 | 15 | 15 | 14 | 14 | 14 | 15 | 12 | 10 | 9 |