Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Muara Siau, Indonesia—a region characterized by its tropical climate and intense sun exposure. The UV Index provides valuable insights into the level of ultraviolet radiation on any given day, allowing you to take necessary precautions against sunburn and long-term skin damage. With peak UV levels reaching as high as 13 around noon, it’s vital to remain vigilant about sun safety, especially in a place where sunny weather is amply enjoyed. By being aware of these levels, you can better protect your skin health and enjoy the beautiful outdoors without the risk of harmful effects from UV rays.
As the sun rises, the UV Index begins its gradual ascent, hitting a mild 1 by 7:00 AM. The intensity grows steadily, reaching 2 by 8:00 AM and then surging to 5 at 9:00 AM. By 10:00 AM, the index peaks at a robust 8, warning of increasing exposure risk. 11:00 AM sees the UV rays intensify to an impressive 11, leading to a maximum of 13 at 12:00 PM, making it critical to stay protected. The afternoon sun starts to mellow out, dropping to 12 by 1:00 PM, then gradually tapering off to 10 at 2:00 PM, 6 at 3:00 PM, and further declining to 3 at 4:00 PM. Finally, as evening descends, the index falls to 1 by 5:00 PM and remains at that level through 6:00 PM, until fading to 0 after sunset at 7:00 PM. Stay vigilant and shield yourself during those peak midday hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | 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 shows extreme levels of solar radiation throughout the year, with particularly high values from January to May, peaking at 17 in March. While January to April have the highest indices of 15-17, June to August see a slight decrease, ranging from 12 to 15. However, the risk remains extreme even in the cooler months, sustaining a burn time of just 10 minutes across all months. As such, visitors and residents should take proactive measures year-round, including wearing broad-spectrum sunscreen, protective clothing, and UV-blocking sunglasses to mitigate health risks associated with sun exposure, especially from January to April when UV levels are at their highest.
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 |
| Muara Siau | 15 | 16 | 17 | 16 | 14 | 12 | 13 | 15 | 15 | 15 | 15 | 15 |