Last updated: June 2, 2025
Understanding the UV Index is crucial for the residents of Tanah Merah, Indonesia, where the climate is generally tropical and exposure to the sun can be intense. The UV Index indicates the strength of ultraviolet radiation on a given day, serving as a vital tool for sunburn prevention and overall skin health. With peak UV levels soaring as high as 11 during midday, awareness of these numbers helps mitigate risks associated with sun exposure, including skin damage and long-term health concerns. Staying informed about UV levels is essential for enjoying Tanah Merah's beautiful outdoors safely while protecting your skin from potential harm.
As the sun rises, the UV Index climbs steadily, starting at a gentle 1 at 7:00 AM. By 8:00 AM, it reaches 3, marking the beginning of increased sun exposure. The day continues to heat up, with the index peaking at a remarkable 11 from 11:00 AM to 12:00 PM, indicating a high risk for harm from unprotected sun exposure. As the afternoon sets in, it gradually declines, dropping to 6 by 2:00 PM and subsequently to 3 by 3:00 PM. As the sun begins to descend, the index returns to a safer 1 by 4:00 PM and tapers off to 0 after 6:00 PM. This hourly trend underscores the importance of sun protection during the midday hours when the UV exposure is at its highest.
| 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 | 9 | 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 |
The UV Index data indicates extremely high levels of UV radiation throughout the year, particularly in the peak months of January to April, where the UV Index reaches a maximum of 17. This signifies a high-risk period for sunburn, with a burn time of merely 10 minutes for unprotected skin. Although the UV Index begins to decline slightly in the summer months, values remain in the 11 to 13 range from June through August, still warranting caution. The fall and winter months (September to December) continue to present high risks, with UV Index values between 14 and 16, reiterating the importance of sun safety year-round. Residents and visitors are strongly advised to take protective measures, such as wearing sunscreen, protective clothing, and seeking shade, to minimize the risks associated with prolonged sun 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 |
| Tanah Merah | 16 | 17 | 17 | 16 | 13 | 11 | 12 | 13 | 15 | 16 | 14 | 14 |