Last updated: July 2, 2025
Understanding the UV Index in San Antonio, Peru is crucial for maintaining healthy skin and preventing sunburn, especially given the region's tropical climate. With UV levels peaking during midday, it's essential to stay informed about these measurements to protect yourself from harmful radiation. In San Antonio, where sunny days are the norm, the risk of overexposure is significant, particularly between the hours of 11 AM and 1 PM when the UV Index can soar to 11, signifying an extreme risk of harm. Being aware of these levels empowers you to take proactive steps for your skin health—whether that’s seeking shade, wearing protective clothing, or applying sunscreen—ensuring you enjoy the sun safely.
The UV Index rises sharply throughout the morning, starting from a modest 1 at 07:00 and making a steady climb to reach its peak of 11 at both 11:00 and 12:00. During this prime time, sun protection is essential to safeguard against harmful rays. As the afternoon progresses, the index begins to decline, dropping to 10 at 13:00 and then tapering off to 4 by 15:00. By late afternoon, the UV Index diminishes significantly, falling to 1 by 17:00 and ultimately reaching 0 at 18:00 and 19:00. This trend emphasizes the importance of planning outdoor activities for early morning or late afternoon to enjoy the sun safely!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV Index levels remain alarmingly high, particularly from January through April, where the index peaks at 17 in March, categorizing the risk of harm from unprotected sun exposure as extreme with a burn time of just 10 minutes. The high-risk months for UV exposure are undeniably the first four months of the year, demanding heightened caution from visitors and residents alike. As the year progresses into May through July, the UV Index gradually decreases but maintains an extreme rating, emphasizing the need for sun protection during outdoor activities. Even in the later months, from August to November, the UV Index remains elevated, never dropping below 12, signaling that vigilance is essential year-round. Residents and visitors should apply sunscreen generously, wear protective clothing, and seek shade during peak sun hours to safeguard their health against harmful UV radiation.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Callao UVI | 14 | 14 | 14 | 12 | 10 | 9 | 10 | 11 | 12 | 13 | 14 | 13 |
| Lima UVI | 14 | 14 | 14 | 12 | 10 | 9 | 10 | 11 | 12 | 13 | 14 | 13 |
| Trujillo UVI | 15 | 15 | 15 | 14 | 12 | 11 | 11 | 11 | 13 | 14 | 14 | 14 |
| Chiclayo UVI | 14 | 15 | 15 | 14 | 13 | 11 | 11 | 12 | 15 | 14 | 14 | 13 |
| San Antonio | 15 | 16 | 17 | 16 | 13 | 12 | 11 | 12 | 14 | 14 | 13 | 13 |
| Arequipa UVI | 18 | 17 | 17 | 15 | 12 | 10 | 11 | 13 | 15 | 17 | 18 | 17 |