Last updated: May 3, 2025
Understanding the UV Index in Surabaya, Indonesia is crucial for safeguarding your skin against harmful ultraviolet radiation. With the tropical climate of Surabaya, where the sun's rays can be particularly intense, being aware of UV levels is essential for preventing sunburn and maintaining overall skin health. During peak hours, especially between 10 AM and 2 PM, UV Index values can soar as high as 12, indicating a very high risk of harm from unprotected sun exposure. Adopting sun safety measures based on this vital information can help you enjoy the beautiful Indonesian sun while keeping your skin safe and healthy.
The UV Index throughout the day showcases a dramatic rise and fall, reflecting the sun's intensity. Starting at 07:00, it kicks off with a mild 2, gradually climbing to reach a peak of 12 by 11:00 and 12:00, indicating a strong potential for skin damage without protection. As the afternoon progresses, the index begins its descent, dropping to 10 at 13:00, then sharply falling to 6 by 14:00. The late afternoon sees a further decline, with values dwindling to 3 at 15:00, and finally tapering off to 1 by 17:00 and 18:00, before settling at 0 in the evening. This data emphasizes the importance of sun safety measures, especially during the hours of 10:00 to 14:00, when the sun is at its most potent.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 11 | extreme | 10 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 1 | 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 significant seasonal variations, with extreme exposure levels predominantly influencing the first nine months of the year. Notably, January to April show high UV values ranging from 12 to 15, marking these as critical months with a burn time of only 10 minutes. Although June offers a slight respite with a very high UV Index of 10 (burn time increases to 15 minutes), the threat escalates again in July and August, returning to extreme levels. September continues this trend with a UV Index of 14, dropping slightly in October through December, but maintaining a consistently extreme level of 13 throughout the winter months. Visitors and residents should remain vigilant, especially from January to September, ensuring the use of adequate sun protection measures, like sunscreen, protective clothing, and seeking shade, particularly during peak UV hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Surabaya | 13 | 15 | 14 | 12 | 12 | 10 | 11 | 12 | 14 | 13 | 13 | 13 |
| Bekasi UVI | 14 | 16 | 16 | 14 | 11 | 10 | 10 | 11 | 13 | 15 | 14 | 13 |
| Jakarta UVI | 14 | 16 | 16 | 14 | 11 | 10 | 10 | 11 | 13 | 15 | 14 | 13 |
| Medan UVI | 13 | 15 | 15 | 15 | 14 | 12 | 12 | 13 | 14 | 14 | 13 | 12 |
| Bandung UVI | 15 | 16 | 16 | 15 | 12 | 11 | 11 | 12 | 14 | 15 | 15 | 14 |