Last updated: January 18, 2026
Understanding the UV Index is crucial for residents and visitors of Randuagung, Indonesia, where the tropical climate can expose the skin to significant levels of ultraviolet radiation. Knowing the UV levels can help prevent sunburn and protect skin health, making it essential to stay informed about the daily fluctuations. In Randuagung, the UV Index peaks at an impressive 12 around midday, posing a serious risk of overexposure and necessitating precautions. With maximum exposure typically occurring in the warmer hours, it's vital for everyone to monitor these levels to enjoy the sun safely.
The UV Index varies dramatically throughout the day, peaking impressively at 12 around 11:00 AM, indicating a significant risk of harm from unprotected sun exposure. The morning starts off gently at a low 1 at 7:00 AM, climbing steadily to 4 by 8:00 AM and reaching 7 by 9:00 AM. As the sun climbs higher, the index surges to 10 at 10:00 AM before peaking, making midday the most hazardous time for sun exposure. Relief comes after noon, as the UV Index drops to 9 at 1:00 PM, then further declines to 3 at 3:00 PM. By late afternoon, it settles back to 1 by 4:00 PM and finally reaches 0 by 6:00 PM, providing a safe window for evening outdoor activities. Stay protected during the peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 60+ minutes |
| 08:00 | 5 | moderate | 30–60 min |
| 09:00 | 9 | very high | 10–15 min |
| 10:00 | 12 | extreme | <10 minutes |
| 11:00 | 14 | extreme | <10 minutes |
| 12:00 | 13 | extreme | <10 minutes |
| 13:00 | 11 | extreme | <10 minutes |
| 14:00 | 8 | very high | 10–15 min |
| 15:00 | 4 | moderate | 30–60 min |
| 16:00 | 2 | low | 60+ minutes |
| 17:00 | 1 | low | 60+ minutes |
| 18:00 | 0 | low | 60+ minutes |
| 19:00 | 0 | low | 60+ minutes |
The UV Index in the region shows extreme levels from January through April, reaching a peak of 16 in October. This indicates that from January to April and again in September, October, and December, visitors and residents are at high risk for UV exposure, with a dangerously short burn time of just 10 minutes. May sees a decline to an index of 12, though it remains extreme, while June experiences a slight reduction to 10, classified as very high. The peak exposure months, where caution should be exercised, are February, March, September, and October. It is essential for everyone to take precautions during these high-risk months, such as wearing protective clothing, applying sunscreen regularly, and seeking shade during peak sun hours.
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 |
| Randuagung | 14 | 15 | 15 | 14 | 12 | 10 | 12 | 13 | 15 | 16 | 14 | 15 |