Last updated: August 1, 2025
Understanding the UV Index is essential for residents and visitors in Wongsorejo, Indonesia, where the tropical climate brings high levels of UV radiation year-round. Awareness of UV levels is crucial not only for preventing painful sunburns but also for protecting long-term skin health. With peak UV readings reaching as high as 12 around noon, it's important to stay informed about daily variations in UV exposure. Knowing when to seek shade or apply sunscreen can help you enjoy the beautiful sunlight while minimizing health risks. In Wongsorejo, the sun shines brightly, making it vital to assess the UV Index and take necessary precautions to enjoy outdoor activities safely.
As the day begins, the UV Index starts at a mild 2 at 7:00 AM, but it quickly escalates as the sun rises. By 10:00 AM, it peaks at a striking 10, indicating a high risk of harm from unprotected sun exposure. The intensity continues to dominate until 12:00 PM, when it slightly dips to 11 but remains a major concern. As afternoon approaches, the UV Index gradually descends from 9 at 1:00 PM to 6 by 2:00 PM, before more noticeable declines occur, settling at 3 by 3:00 PM. The evening brings a steady reduction, with readings plummeting to 1 by 4:00 PM and 5:00 PM, and finally dropping to zero after 6:00 PM. It's a vivid reminder that during peak hours, taking precautions against sun exposure is essential for skin health!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 12 | extreme | 10 min |
| 11:00 | 14 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, ultraviolet (UV) radiation levels remain extremely high, with a UV Index consistently above 10 from January through November. The most critical months for UV exposure are February and October, where the UV Index peaks at 16, indicating a very high risk of harm from unprotected sun exposure, with a burn time of just 10 minutes. Residents and visitors alike should be particularly vigilant during these months, ensuring they wear broad-spectrum sunscreen, protective clothing, and seek shade whenever possible. Maintaining a proactive approach to sun safety is crucial year-round, as even the seemingly milder months still carry significant risk.
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 |
| Wongsorejo | 14 | 16 | 15 | 14 | 12 | 11 | 12 | 14 | 15 | 16 | 14 | 14 |