Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in San Juan, Peru, where the sun's intensity can pose significant risks to skin health. With high UV levels peaking at 13 between 11:00 AM and 12:00 PM, awareness is key to preventing sunburn and reducing long-term skin damage. Given San Juan's Af climate, characterized by warm temperatures and clear skies, knowing when to seek shade or apply sunscreen is vital for protecting yourself during the highest risk hours of exposure. Staying informed about the UV Index not only contributes to your personal health but also enhances your overall enjoyment of the beautiful Peruvian sun.
The UV Index peaks spectacularly throughout the morning and early afternoon, making sun safety a top priority. Starting at a modest 1 at 07:00, it quickly escalates to 3 by 08:00. As the sun climbs higher, the index surges to 7 at 09:00 and reaches its zenith, 13, by both 11:00 and 12:00. This intense mid-day exposure signals outdoor enthusiasts to exercise caution and apply sunscreen diligently. The index begins to taper off after 13:00, descending to 9 by 14:00 and falling to 5 at 15:00. As we transition into the late afternoon and evening, the UV Index plummets, dropping to 2 at 16:00, and finally sinking to 0 by 18:00, making the later hours safe for evening outings. Keep this hourly forecast in mind to protect your skin and enjoy the sun responsibly!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 13 | 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 experiences its highest values from January to April, peaking at 17 in March, which signifies extreme exposure risks for skin and eyes. The burn time during these months is a mere 10 minutes, making it crucial for visitors and residents to take protective measures, such as wearing sunscreen, sunglasses, and protective clothing. Although the UV Index slightly decreases during the summer months, it remains in the extreme category from May to August, maintaining a burn time of 10 minutes. September, October, and November see a slight decline, yet the UV Index still holds at levels that require caution. Therefore, throughout the year, but particularly from January to April, it is essential for everyone to stay informed and proactive in sun protection strategies to mitigate the risks associated with high UV exposure.
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 Juan | 15 | 16 | 17 | 16 | 13 | 12 | 11 | 12 | 13 | 14 | 13 | 13 |
| Arequipa UVI | 18 | 17 | 17 | 15 | 12 | 10 | 11 | 13 | 15 | 17 | 18 | 17 |