Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Sibolga, Indonesia, where the tropical climate brings high levels of ultraviolet (UV) radiation year-round. With peak UV levels reaching a striking 12 around midday, awareness of these daily fluctuations is vital for sunburn prevention and maintaining long-term skin health. Given the city's exposure risks, particularly during the sunniest hours, staying informed about UV levels can help safeguard your skin against harmful effects. Don’t leave your health to chance—take steps to protect yourself while enjoying the beautiful weather that Sibolga has to offer!
As the day unfolds, the UV Index dramatically rises, peaking at a maximum of 12 around noon. At 07:00, the morning sun barely registers with a low of 1, but by 09:00 the intensity increases to 4, signaling the need for some sun protection. The heat intensifies further, with the index soaring to 11 by 11:00 and staying at a blistering 12 between 12:00 and 13:00. After this peak, a gradual decline begins: at 14:00, it drops to 10, and by 15:00 it cools off to 7. The late afternoon brings a further decrease, with the UV levels falling to 4 by 16:00 and tapering off to 1 by 17:00. As the sun sets, the index finally reaches 0 by 19:00, marking the end of its strong impact for the day. Remember to stay protected during peak hours!
| 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 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index remains exceptionally high throughout the year, with the highest values occurring from January to April, peaking at 16 during March and April. These months, characterized by an extreme exposure category, necessitate a burn time of just 10 minutes before skin damage may occur. Following this peak, UV levels slightly decrease but remain high, with August through October reporting indices between 14 and 15. January to April and the late summer/fall months of August and September are particularly high-risk periods for sun exposure. Residents and visitors should take precautions during these months, such as wearing broad-spectrum sunscreen, protective clothing, and UV-blocking eyewear to safeguard against potential 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 |
| Sibolga | 14 | 15 | 16 | 16 | 15 | 12 | 12 | 14 | 15 | 15 | 14 | 13 |