Last updated: May 3, 2025
In Ratenggoji, Indonesia, understanding the UV Index is crucial for protecting your skin from harmful sun exposure. The UV Index indicates the strength of ultraviolet radiation at different times of the day, helping guide you on when to seek shade and apply sunscreen to prevent sunburn and long-term skin damage. Given Ratenggoji's tropical climate, the risk of intense UV radiation peaks during midday hours, reaching an alarming level of 12 at 11:00 AM and 12:00 PM. Being informed about these UV levels is essential for maintaining your skin health and enjoying the beautiful sun-soaked days this region has to offer.
The UV Index throughout the day exhibits a dramatic rise as the sun reaches its apex. Starting at a minimal 1 at 07:00, the index climbs gradually, hitting 3 by 08:00. The real heat arrives at 09:00, when it surges to 6, peaking at a striking 12 from 11:00 to 12:00—an indication to seek shade and protect your skin. As the afternoon progresses, the index begins to descend, dropping to 10 at 13:00, then gradually decreasing to 4 by 15:00. By late afternoon, the UV intensity diminishes, with values falling to 2 at 16:00, and becoming negligible, hitting 1 by 17:00 before fading into the night with a 0 at 18:00 and beyond. Stay informed and shield yourself from those midday rays!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | 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 |
Throughout the year, the UV Index remains notably high, with extreme levels persisting from January to April and again in July, August, September, October, and November. The high-risk months for UV exposure are consistently January through April, as well as July through September, where the burn time is alarmingly short—approximately 10 minutes for most of these periods. Even in June, while slightly lower at a UV Index of 10, the risk remains very high with a burn time of 15 minutes. To ensure safety, visitors and residents should take proactive measures such as wearing protective clothing, applying sunscreen regularly, and seeking shade, especially during peak sun hours. Being vigilant about UV exposure is essential throughout the year given these consistent, elevated levels.
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 |
| Ratenggoji | 15 | 16 | 16 | 14 | 12 | 10 | 12 | 13 | 15 | 15 | 15 | 14 |