Last updated: July 2, 2025
In San Isidro, Mexico, understanding the UV Index is crucial for safeguarding your skin and overall health. With its warm Aw climate, residents and visitors alike need to be aware of the sun's intensity, especially during peak hours when UV levels can soar to 12 or even 13—a clear warning of potential sunburn and long-term skin damage. By monitoring the UV Index, you can take proactive measures to enjoy the sun safely, ensuring a balance between soaking up its benefits and protecting your skin. Remember, awareness is your first line of defense against the sun's harmful rays!
The UV Index journey begins early, with mild levels of 1 at 07:00 and 08:00. As the sun rises higher, the intensity spikes, reaching 3 by 09:00. By 10:00, it climbs to 6, hinting at the intensifying sun. At 11:00, we hit 9, and by noon, the levels peak at a staggering 12—a clear signal to seek shade! The maximum UV exposure occurs from 13:00 to 14:00, registering 13 before it begins to wane. The afternoon sees a descent back to 10 at 15:00, followed by a gentle dip to 6 at 16:00. As the day transitions into evening, the UV Index drops to 3 at 17:00 and settles back at 1 by 18:00 and 19:00, concluding a day of sunshine and caution. Be sure to protect your skin during peak hours!
| 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 | 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 | 10 | 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 |
The UV Index experiences significant variations throughout the year, reaching its peak during the spring and summer months. From January to April, the UV levels start at 9 and escalate to 14 by April, indicating an extreme exposure category with a rapid decrease in burn time to just 10 minutes. This high-risk period continues through May to October, where the UV Index remains at 12 to 13, maintaining the extreme classification and a burn time of 10 minutes. In November and December, the UV Index decreases to 9 and 8 respectively, categorized as very high, with burn times extending to 15 minutes. Visitors and residents should take proactive measures, especially from February to October, by wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak hours to minimize the risk of sunburn and long-term skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| San Isidro | 9 | 11 | 13 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 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 |