Last updated: July 2, 2025
In Satrejan, Indonesia, understanding the UV Index is critical for safeguarding your skin and overall health. With a tropical climate that often exposes residents to high UV levels, being aware of the UV Index helps in preventing sunburn and reducing long-term skin damage. From 8 AM through 2 PM, UV levels can reach as high as 11, indicating a very high risk of harm from unprotected sun exposure. As you explore the vibrant beauty of Satrejan, staying informed about UV risks ensures that every outdoor adventure is both enjoyable and safe. Don't let the sun catch you off guard—keep your skin protected and healthy!
The UV Index throughout the day presents a clear pattern of increasing intensity, peaking at 11 from 11:00 to 12:00, indicating a significant risk of harm from unprotected sun exposure. Early risers will find a mild start with a maximum of 1 at 07:00, but as the morning progresses, UV levels surge, reaching 6 by 09:00. The sun’s strength continues to escalate, hitting 10 by 10:00, before peaking at the afternoon maximum of 11. However, as the day winds down, UV exposure rapidly diminishes, plummeting back to 1 by 16:00, and ultimately fading to 0 after 18:00. This pattern highlights the importance of sun protection during peak hours, particularly between 11:00 and 12:00.
| 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 | 10 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 9 | 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 |
Throughout the year, UV exposure remains particularly high, with January through April experiencing an extreme UV Index consistently at 15. As spring gives way to summer, May sees a slight decrease at 12, followed by a very high index of 10 in June. From July to September, the UV Index fluctuates between 11 and 15, staying in the extreme category during these months. October to December returns to 15, reinforcing that the risk remains high, even in winter. The high-risk months for UV exposure are January, February, March, July, August, September, October, November, and December, where outdoor enthusiasts and residents should take precautions. It is essential for visitors and residents alike to ensure adequate sun protection, such as wearing sunscreen, protective clothing, and seeking shade, especially during peak sun hours, to mitigate the risk of harmful UV exposure.
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 |
| Satrejan | 15 | 15 | 15 | 14 | 12 | 10 | 11 | 13 | 15 | 15 | 15 | 15 |