Last updated: July 2, 2025
Awareness of the UV Index is crucial for residents and visitors of San Juan, Philippines, where the tropical climate brings about intense sun exposure. Understanding UV levels is paramount in preventing sunburn and promoting long-term skin health, as elevated UV Index readings can lead to harmful effects even in brief periods. With midday UV levels soaring to a staggering 14, the risks of skin damage significantly increase, making it vital for everyone to take precautions, especially during peak hours. Embrace the sun wisely in San Juan to enjoy its beauty while protecting your skin!
As the sun rises, the UV Index gradually climbs, starting with a mild 2 at 07:00. By 08:00, it reaches 4, signaling a need for some sun protection. However, as the day progresses, the index spikes to its peak at 12:00, hitting an intense 14. This mid-day period, particularly from 10:00 to 13:00, is critical, with readings of 10 and 13 respectively, indicating a strong risk of harm from unprotected sun exposure. After the zenith of the afternoon, the index begins its descent, dropping to 9 by 14:00, and further down to 5 by 15:00. As the sun sets, the UV intensity diminishes rapidly, falling back to 1 at 17:00 and finally to 0 by 19:00. Throughout the day, it’s vital to stay informed and safeguard your skin during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | 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 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index exhibits significant seasonal variations, remaining predominantly extreme throughout the year. From January to March, the index climbs steadily, peaking at 16 in both March and April, marking these months as particularly high-risk for sunburn with a burn time of just 10 minutes. May through October maintain an index between 14 and 15, followed by a slight decrease in November and December, where the index drops to 12 and 11, respectively. Visitors and residents should remain vigilant during these high-risk months, especially from January to April, and take necessary precautions such as wearing sunscreen, protective clothing, and sunglasses, to minimize UV exposure during outdoor activities.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Caloocan City UVI | 11 | 13 | 15 | 15 | 13 | 14 | 13 | 14 | 14 | 13 | 10 | 10 |
| Quezon City UVI | 11 | 13 | 15 | 15 | 13 | 14 | 13 | 14 | 14 | 13 | 10 | 10 |
| Manila UVI | 11 | 13 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 13 | 10 | 10 |
| San Juan | 12 | 14 | 16 | 16 | 14 | 14 | 14 | 14 | 15 | 13 | 12 | 11 |
| Budta UVI | 13 | 15 | 16 | 16 | 14 | 13 | 14 | 14 | 15 | 14 | 13 | 11 |
| Davao UVI | 13 | 15 | 16 | 15 | 15 | 13 | 14 | 14 | 15 | 14 | 13 | 11 |