Last updated: June 2, 2025
In the sun-soaked paradise of Gili Trawangan, Indonesia, staying informed about the UV Index is vital for safeguarding your skin health. With intense UV radiation peaking around midday, reaching levels as high as 10, it’s crucial to understand the daily UV fluctuations and their potential impacts—namely, the risk of sunburn and long-term skin damage. The tropical climate of Gili Trawangan means that residents and visitors alike face heightened exposure to UV rays, particularly during the hours of 10 AM to 2 PM. By keeping a close eye on the UV Index, you can enjoy the island's stunning beaches while taking the necessary precautions to protect your skin.
The UV Index offers a glimpse into the sun's intensity throughout the day. At 07:00, it starts gently with a reading of 1, gradually climbing to 2 by 08:00. As the sun rises higher, the index peaks at an impressive 10 at 12:00, indicating the most potent rays. It slightly eases to 9 at 13:00 and then descends further to 7 at 14:00, before falling to 5 by 15:00. The late afternoon brings a significant drop, with the index retreating to 2 at 16:00 and dwindling to 1 by 17:00. By 18:00 and 19:00, the UV Index returns to 0, signaling the end of the sun's peak intensity for the day. Be sure to protect your skin during those midday hours when the sun is strongest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 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 exhibits significant seasonal changes, with the highest levels occurring from January to April, where it reaches an extreme rating of 15-16 and a rapid burn time of just 10 minutes. July and August also present high-risk conditions with indices of 11 and 13 respectively. Recognizing these trends, January through April and July through September are particularly high-risk months for UV exposure. Residents and visitors should take extra precautions during these periods, such as seeking shade, wearing protective clothing, and applying sunscreen frequently, to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Surabaya UVI | 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 |
| Gili Trawangan | 15 | 16 | 15 | 15 | 13 | 10 | 11 | 13 | 15 | 15 | 14 | 14 |