Last updated: July 2, 2025
Awareness of the UV Index is crucial for residents and visitors of San Isidro, Buenos Aires, as understanding the sun’s ultraviolet (UV) levels can aid significantly in preventing sunburn and protecting overall skin health. With a climate classified as Cwb, San Isidro experiences varied but often intense levels of UV radiation throughout the day, peaking around noon with an index soaring to 15. Consequently, knowing when these levels are highest can empower you to take necessary precautions against UV exposure, ensuring a safer and healthier outdoor experience in this vibrant locale.
The UV Index for the day presents a striking pattern of intensity as the sun rises and reaches its zenith. Beginning at 1 at 07:00 and 08:00, the index gradually climbs to 3 by 09:00. As the morning progresses, it spikes dramatically, peaking at an impressive 15 from 13:00 to 14:00. This period of high UV exposure, highlighted by a maximum of 13 at 12:00, underscores the potential risks for outdoor activities without proper protection. Following this peak, the index gracefully declines, dipping to 9 at 16:00 and tapering off to 1 again by 19:00. It’s a reminder to embrace the sun wisely, prioritizing skin safety during those mid-afternoon 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 | 5 | moderate | 30 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 15 | extreme | 10 min |
| 14:00 | 15 | extreme | 10 min |
| 15:00 | 12 | extreme | 10 min |
| 16:00 | 9 | very high | 15 min |
| 17:00 | 5 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The seasonal UV changes indicate that from January to March, UV exposure begins high, escalating to extreme levels by April. The peak UV Index occurs in July at 15, maintaining extremely high levels throughout the summer months with minimal fluctuations. High-risk months include February through August, where the UV Index remains between 12 and 15, necessitating careful sun protection measures. Visitors and residents are strongly advised to limit sun exposure, especially during peak hours, wear protective clothing, use broad-spectrum sunscreen, and seek shade to minimize the risk of sunburn and skin damage. In contrast, November and December see a drop in the UV Index to 10 and 9, respectively, representing a relatively safer time for sun exposure, though caution is still recommended.
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 Isidro Buenos Aires | 10 | 12 | 13 | 14 | 14 | 14 | 15 | 13 | 14 | 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 |