Last updated: January 18, 2026
Understanding the UV Index in Mranggen, Indonesia is crucial for residents and visitors alike, as it plays a vital role in protecting skin health and preventing sunburn. The region's tropical climate brings high UV exposure, especially during midday hours when the index peaks at 10. Knowing these levels helps you take proactive steps to shield yourself from harmful rays, whether you're enjoying outdoor activities or simply basking in the sun. With awareness of the UV Index, you can enjoy Mranggen’s sunny days safely while safeguarding your skin from long-term damage.
The UV Index paints a vivid picture of a sun-drenched day, starting with a mild 1 at 07:00 and rapidly escalating to its peak. As the sun climbs higher, 08:00 sees it at 3, but by 09:00, it spikes to a brisk 6. The heat really intensifies around 10:00, where it hits 9, and reaches its zenith with a 10 at both 11:00 and 12:00. After this peak, a gradual decline begins; by 13:00, it's at 9, then falls to 6 by 14:00. The afternoon cools off with values of 3 at 15:00 and then plummets back to 1 at 16:00 and 17:00. As the sun sets, the UV Index drops to 0 by 18:00, marking the end of a fascinating solar journey for the day. Be sure to enjoy the sunshine, but don’t forget your sunscreen during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 60+ minutes |
| 08:00 | 4 | moderate | 30–60 min |
| 09:00 | 8 | very high | 10–15 min |
| 10:00 | 11 | extreme | <10 minutes |
| 11:00 | 13 | extreme | <10 minutes |
| 12:00 | 14 | extreme | <10 minutes |
| 13:00 | 12 | extreme | <10 minutes |
| 14:00 | 9 | very high | 10–15 min |
| 15:00 | 5 | 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 |
Throughout the year, UV levels show significant variation, with the highest readings occurring in the winter and early spring months. From January to April, the UV Index remains in the extreme category, peaking at 15 in February and March, with a burn time of just 10 minutes. As we transition into the summer months, the UV Index decreases slightly, reaching a very high level of 10 in June and July, allowing for a burn time of 15 minutes. The UV levels then rise again into the extreme category by August, with a notable 12. The high-risk months for UV exposure are from January through April, where immediate protection is essential. Visitors and residents are strongly advised to take precautions, including wearing sunscreen, protective clothing, and seeking shade, especially during these peak months 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 |
| Mranggen | 14 | 15 | 15 | 13 | 12 | 10 | 10 | 12 | 13 | 14 | 14 | 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 |