Last updated: July 2, 2025
In San Francisco Jacona, Mexico, understanding the UV Index is crucial for safeguarding your skin and overall health. The UV Index measures the strength of ultraviolet radiation, which can lead to sunburn and long-term skin damage. With a typical climate characterized by warm temperatures and clear skies, residents and visitors alike must remain vigilant, particularly during peak hours when UV levels can soar to critical levels—reaching a high of 14 around midday. By staying informed about UV levels, you can take proactive steps to enjoy the sun safely while minimizing your risk of sunburn and skin conditions.
At dawn, the UV Index starts off low, with a maximum of 1 at both 07:00 and 08:00. As the sun climbs higher, the intensity begins to rise sharply, reaching 3 by 09:00 and jumping to 6 by 10:00. The real heat hits at 11:00, peaking at a scorching 10, before hitting an astonishing 13 at 12:00 and peaking at 14 by 13:00. The afternoon witnesses a slight decline, settling back to 13 at 14:00 and dropping to 11 by 15:00. As the day winds down, the UV Index continues to lessen, falling to 7 at 16:00, and further slipping to 4 by 17:00. By 18:00, it's down to 2, and as night falls, it returns to a safe 1 by 19:00. Be sure to stay sun safe during peak hours when the UV Index soars!
| 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 | 14 | extreme | 10 min |
| 14:00 | 13 | extreme | 10 min |
| 15:00 | 11 | extreme | 10 min |
| 16:00 | 7 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index demonstrates significant seasonal variation, with peak levels occurring from February to October. The highest risk months are March through October, where the UV Index consistently reaches 14, classified as extreme with a minimal burn time of just 10 minutes. Visitors and residents should take precautionary measures during these months, such as wearing protective clothing, applying sunscreen with high SPF, and seeking shade to minimize sun exposure. In contrast, January, November, and December experience lower UV levels, classified as very high, with burn times extending to 15 minutes. However, it's still important to remain vigilant about sun safety year-round.
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 Jacona | 10 | 12 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 12 | 10 | 9 |
| 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 |