Last updated: August 1, 2025
Understanding the UV Index is crucial for residents and visitors of Ullong, Indonesia, where the sun's rays can be particularly intense. With an Af climate, Ullong experiences high UV exposure throughout the day, especially between 10:00 AM and 1:00 PM, when levels peak at 13. Being aware of these UV levels is essential for sunburn prevention and maintaining skin health, as overexposure can lead to adverse effects such as skin damage and increased cancer risk. By staying informed about the UV Index, you can take the necessary precautions to enjoy the beautiful Indonesian sun safely.
The UV Index throughout the day showcases a distinct pattern of increasing and decreasing intensity. Starting at an inconspicuous low of 1 at 07:00, it gradually rises to a moderate 2 by 08:00. The real surge begins at 09:00, with the index climbing to 5, then tipping into the high range with a peak of 13 at 12:00. The sun's strength is undeniable, as it reaches its pinnacle at 11:00 with a robust 12 before mildly tapering off to 9 by 14:00 and subsequently declining. As the afternoon wanes, the index falls to 3 by 16:00, trailing off to a gentle 1 by early evening and concluding the day at a safe 0 by 19:00. This hourly UVI data serves as a reminder to stay protected during the peak hours of 11:00 to 14:00 to ensure a safe and enjoyable day outdoors!
| 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 | 11 | extreme | 10 min |
| 11:00 | 14 | extreme | 10 min |
| 12:00 | 15 | extreme | 10 min |
| 13:00 | 14 | 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 significant seasonal variability, with the highest readings occurring from January to April, when the index peaks at 18, classified as extreme exposure. These months represent the highest risk for sunburn, with a burn time of just 10 minutes for unprotected skin. As temperatures begin to rise in May and June, the UV Index slightly decreases to 15 and 13, respectively, yet remains in the extreme category with the same burn time. Risk levels persist through the summer and into the fall, with September and October displaying an index of 16. Visitors and residents should take precautionary measures such as applying sunscreen, wearing protective clothing, and seeking shade during peak sun hours, particularly during these high-risk months to minimize their exposure and protect their skin.
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 |
| Ullong | 16 | 18 | 18 | 18 | 15 | 13 | 13 | 15 | 16 | 16 | 15 | 15 |