Last updated: May 3, 2025
In San Isidro, Philippines, being aware of the UV Index is crucial for safeguarding your skin against harmful solar radiation. The understanding of UV levels is essential not just for preventing sunburn, but also for promoting long-term skin health and preventing serious conditions such as skin cancer. With a climate characterized by hot, tropical conditions, inhabitants and visitors alike should take note that UV exposure can reach alarming levels, peaking at 14 in midday hours. By staying informed about the UV Index, you can enjoy the sunny days while protecting yourself from excessive exposure—ensuring that your time spent outdoors remains both pleasant and safe.
The UV Index throughout the day shows a significant rise, peaking dramatically between 12:00 PM and 1:00 PM, when it reaches a maximum of 14. Early morning hours start off relatively mild, with a 2 at 7:00 AM, gradually climbing to 4 by 8:00 AM. As the sun rises higher, 9:00 AM sees a notable leap to 7, followed by an intense 10 at 10:00 AM. The 11:00 AM mark escalates to 13, making the midday sun a prime time for sun protection. After this peak, the index begins to decline, tapering to 12 at 1:00 PM, and descending through the afternoon to 6 by 3:00 PM. As evening approaches, the UV Index drops sharply, concluding at 0 by 7:00 PM. This data emphasizes the importance of UV awareness during 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 | 6 | high | 25 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 experiences a peak from March to October, remaining in the extreme category with values consistently at or above 13. Notably, the months of April and May record the highest UV Index at 15 and 13, respectively, indicating significant risk for skin damage. Residents and visitors should be especially cautious from March through October, as the burn time remains short at just 10 minutes during these months. In December, the UV Index drops slightly to 10, transitioning to the very high category, allowing for a slightly longer burn time of 15 minutes. To protect your skin, it is essential to wear sunscreen, seek shade, and wear protective clothing during these high-risk periods.
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 Isidro | 11 | 13 | 14 | 15 | 13 | 14 | 14 | 14 | 14 | 13 | 11 | 10 |
| 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 |