Last updated: May 3, 2025
Understanding the UV Index in San Juan, Peru is crucial for protecting your skin from harmful ultraviolet radiation. High UV levels can lead to sunburn, skin damage, and even long-term health issues, making it essential to stay informed about daily UV exposure. With San Juan's BWk climate, which often features intense sunlight, residents and visitors alike must be vigilant, especially during peak hours when the UV Index soars to 14 around midday. Prioritizing UV awareness not only helps in enjoying the sun safely but also fosters a healthier lifestyle in this vibrant location.
The UV Index rises dramatically throughout the morning, jumping from a mild 1 at 07:00 to a peak of 14 by 12:00. As the sun reaches its zenith, the intensity surpasses 10 between 10:00 and 13:00, signaling an urgent need for sun protection. The index then gracefully declines, dropping to 5 by 15:00 and falling progressively to 0 as evening approaches, marking the day's end at 19:00. This pattern highlights the importance of staying shielded during the peak hours, especially from 11:00 to 13:00, when the sun's rays are at their strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 5 | 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 |
The UV Index data reveals extremely high levels of ultraviolet radiation throughout the entire year, with consistently high values between 14 and 19 from January to November. Notably, the highest risk months for UV exposure are from January to April, where the UV Index peaks at 19 in February and remains over 17 through April. May through September still maintain high levels, but are slightly lower, ranging from 11 to 16. Finally, October to December return to extreme levels at 18. Visitors and residents are strongly advised to take precautions, such as wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade, especially during daytime hours when UV exposure is at its highest to prevent sunburn and long-term skin damage.
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 |
| Arequipa UVI | 18 | 17 | 17 | 15 | 12 | 10 | 11 | 13 | 15 | 17 | 18 | 17 |
| San Juan | 18 | 19 | 18 | 17 | 14 | 11 | 13 | 14 | 16 | 18 | 18 | 18 |