Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Ketahun, Indonesia, where the tropical climate brings a unique set of challenges regarding sun exposure. With peak UV levels reaching a dangerous 12 around midday, awareness of UV index readings helps protect against sunburn and long-term skin damage. Being informed empowers individuals to take necessary precautions, especially during the hot hours between 10 AM and 2 PM when the risk is highest. With a climate characterized by generally high UV rays, recognizing these daily fluctuations can make a significant difference in maintaining skin health and overall well-being.
As the day unfolds, the UV Index rises steadily, peaking at a striking 12 between noon and 1 PM, a clear signal for the sun's intense power. Starting from a gentle 1 at 7 AM, it escalates to a moderate 4 by 9 AM, and then surges to an 8 by 10 AM, urging early risers to seek shade. The index reaches its zenith with an aggressive 11 at 11 AM, warning of the necessity to protect skin. As the afternoon wears on, it begins to decline, dropping to a 9 by 2 PM, and dwindling further to a 3 by 4 PM. By the time the clock strikes 6 PM, the index returns to a modest 1, providing a gentle reminder of the day’s solar intensity before fading to 0 by 7 PM. Enjoy the sun, but stay safe!
| 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 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 9 | 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 remains at extreme levels throughout the year, with the highest readings in January (15) and February (16), where the burn time is a mere 10 minutes. Significant high-risk months for skin damage include February, March, and April when the UV levels reach a peak of 16. As we transition into summer, the index slightly decreases but remains at 12 from June to July, before rising again to 14 in August. Visitors and residents should be vigilant and take precautions year-round, using sunscreen, wearing protective clothing, and seeking shade to minimize exposure during peak hours, especially in the high-risk months when the UV Index escalates. Regular skin checks and protective measures are essential to maintaining skin health in these extreme conditions.
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 |
| Ketahun | 15 | 16 | 16 | 15 | 14 | 12 | 12 | 14 | 15 | 15 | 15 | 14 |