Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Sewon, Indonesia, as it serves as a reliable gauge of the sun's ultraviolet radiation levels throughout the day. Being aware of these levels is essential for preventing sunburn, protecting skin health, and reducing the risk of long-term damage. Given Sewon's tropical climate, residents experience significant UV exposure, especially during midday when the index peaks at 12. By paying attention to the UV Index, you can enjoy the sun safely while safeguarding your skin.
The UV Index throughout the day presents a striking pattern of intensity. Starting from a mild level of 1 at 07:00, the sun steadily gains strength, peaking at an impressive 12 between 11:00 and 12:00. As the morning progresses, 09:00 and 10:00 also see significant values of 7 and 10, respectively. After midday, the intensity begins to wane, dipping to 10 at 13:00 before gradually decreasing to 3 by 15:00. In the late afternoon and evening, the UV Index falls sharply—registering only 1 at 16:00 and tapering down to 0 from 18:00 onwards. This data highlights the importance of sun protection during peak hours, especially when the UV Index reaches its zenith.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | 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 | 6 | 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 |
The UV Index data reveals a clear pattern of seasonal changes, with the highest values occurring from January through March, where it consistently reaches an extreme level of 15 or 16, resulting in a rapid burn time of just 10 minutes. April sees a slight decrease to 14, but remains categorized as extreme. May marks the last month of extreme risk at 12, followed by a transition to very high with a UV Index of 10 in June. As summer progresses, July and August boast an extreme level of 11 and 13. Notably, September bounces back to 14 before tapering down as the year ends, with October and November peaking again at 15. December closes the year at 14. Given these readings, visitors and residents should exercise increased caution during these high-risk months—particularly from January through April and again in September—by wearing protective clothing, applying broad-spectrum sunscreen, and limiting sun exposure during peak hours to reduce the risk of 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 |
| Sewon | 15 | 15 | 16 | 14 | 12 | 10 | 11 | 13 | 14 | 15 | 15 | 14 |
| Bandung UVI | 15 | 16 | 16 | 15 | 12 | 11 | 11 | 12 | 14 | 15 | 15 | 14 |