Last updated: July 2, 2025
Understanding the UV Index is essential for residents and visitors of San Luis, Argentina, as it plays a crucial role in safeguarding your skin health and preventing sunburn. With the region’s BSk climate characterized by its dry conditions and heightened solar exposure, being aware of UV levels helps you take proactive measures against harmful effects of the sun. During peak hours, the UV Index can rise to 4, indicating moderate risk, making it vital to adopt protective strategies such as wearing sunscreen and protective clothing. By staying informed about the UV Index, you can enjoy the sunshine safely and maintain healthy skin throughout your time in San Luis.
The UV Index for the day reveals a gradual rise in sun intensity, starting from a low 0 at 07:00 and 08:00. As the sun climbs higher, it reaches a moderate 1 by 09:00 and 10:00. By 11:00, the index escalates to 2, signaling the need for some sun protection. The peak intensity occurs between 12:00 and 14:00, where the UV Index hits 4, suggesting it's the best time for outdoor precautions. A slight decline follows, tracing down to 3 at 15:00 and descending further to 2 by 16:00. As the day winds down, conditions become gentler, with values returning to 1 at 17:00 and 18:00, ultimately falling back to 0 by 19:00. Stay mindful of the sun’s strength during the peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 0 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 1 | low | 45 min |
| 11:00 | 2 | low | 45 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 4 | moderate | 30 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV Index values fluctuate significantly, with extreme risk levels occurring mainly in January, February, March, October, November, and December—all of which have a UV Index of 15 or higher and a burn time of just 10 minutes. From April to August, the UV Index dips to very high and moderate categories, reaching a peak in April at 8 and returning to 6 in August. Visitors and residents are strongly advised to take precautions during the high-risk months of January, February, March, October, and November by wearing protective clothing, using broad-spectrum sunscreen, and limiting sun exposure, particularly during midday hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Buenos Aires UVI | 14 | 13 | 11 | 7 | 5 | 4 | 4 | 6 | 8 | 10 | 13 | 14 |
| Rosario UVI | 14 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 13 | 14 |
| San Luis | 15 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 14 | 15 |
| Mendoza UVI | 15 | 14 | 12 | 8 | 6 | 4 | 5 | 6 | 9 | 12 | 14 | 15 |
| Cordoba UVI | 15 | 13 | 12 | 9 | 6 | 4 | 5 | 7 | 9 | 12 | 14 | 15 |
| San Miguel de Tucuman UVI | 15 | 14 | 13 | 10 | 7 | 5 | 6 | 7 | 10 | 13 | 15 | 15 |