Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of San Luis, as it plays a vital role in safeguarding skin health and preventing sunburn. With the region's arid desert climate (BWh), residents face heightened risks from sun exposure, especially during peak hours when the UV Index can soar to a staggering 12. By staying informed about daily UV levels, you can take proactive measures to protect your skin, ensure outdoor activities remain safe, and enjoy the beautiful sunny days that San Luis has to offer while minimizing health risks.
The UV Index today paints a vibrant picture of sun intensity, starting from a gentle 1 at 07:00 and reaching its peak at 12:00 with a striking 12. The morning hours see a gradual rise, with 09:00 climbing to a moderate 5 and 10:00 bringing it up to 8. As the sun reaches its zenith, the intensity escalates sharply to 10 by 11:00 and holds steady at 12 from 12:00 to 13:00. The afternoon sun begins to mellow after 14:00, dipping down to 10 and further declining to 8 by 15:00. As the day transitions into the evening, the UV Index gently recedes, returning to a mild 3 by 17:00, and finishing with a soft 1 from 18:00 onward. It's crucial to keep aware of these fluctuations to safeguard against overexposure!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As we observe seasonal changes in the UV Index, it becomes clear that higher levels of ultraviolet radiation occur during the warmer months. The high-risk months peak from March to August, with May and June reaching extreme levels (UV Index 11-12) and burn times as low as 10 minutes. Visitors and residents are strongly advised to take precautions during these months by seeking shade, wearing protective clothing, and using sunscreen, especially between 10 AM and 4 PM when UV exposure is at its highest. January, November, and December are comparatively safer, with moderate UV levels (Index 4-5) and longer burn times of 30 minutes. Staying informed about the UV Index is essential for maintaining skin health year-round.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| San Luis | 4 | 6 | 9 | 10 | 11 | 12 | 12 | 11 | 10 | 8 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |