Last updated: July 2, 2025
In Halong, Indonesia, awareness of the UV Index is crucial for anyone enjoying the sun-soaked beauty of this tropical paradise. Understanding UV levels is vital not just for preventing painful sunburns but also for protecting your long-term skin health. With an Af climate that brings higher UV exposure, especially between 10 AM and 2 PM when the index peaks at a scorching 12, it’s essential to stay informed. By keeping an eye on UV levels, residents and visitors alike can make informed choices to enjoy the vibrant outdoors safely, ensuring that the stunning vistas of Halong are enjoyed without the risks associated with harmful rays.
The UV Index throughout the day paints a vivid picture of solar intensity. Starting with a mild 1 at 07:00, the index gradually climbs, reaching 2 by 08:00. A noticeable surge occurs around 09:00, where it hits 4, followed by a significant jump to 7 at 10:00. The peak of the day arrives at 12:00, with an impressive 12, reflecting the sun’s most potent rays. The intensity begins to decline after this peak, dropping to 9 at 14:00 and further down to 6 by 15:00. As the evening approaches, the UV Index falls back to 3 at 16:00 and returns to a comfortable 1 by 17:00, concluding the day with a trivial 0 by 19:00. This data underscores the importance of sun safety during peak hours! 🌞
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 9 | 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 |
Throughout the year, the UV Index remains notably high, with values consistently in the extreme exposure category, particularly between January and October. The highest UV readings occur in February and March at 16, while April and May follow closely with indices of 15 and 14, respectively. As summer approaches, the index dips slightly in June and July to 12, before rising again in August to 14 and peaking in September at 15. The months of February, March, September, and October are critical high-risk periods for UV exposure. Visitors and residents are strongly advised to take precautionary measures during these months, including wearing sunscreen, protective clothing, and seeking shade, as the potential for skin damage from sun exposure is significant, with a burn time of just 10 minutes across all months.
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 |
| Halong | 15 | 16 | 16 | 15 | 14 | 12 | 12 | 14 | 15 | 16 | 14 | 14 |