Last updated: June 2, 2025
Understanding the UV Index is crucial in Ngu Hanh Son, Vietnam, where the tropical climate exposes residents and visitors to variable UV radiation levels throughout the day. With peaks reaching an intense UV Index of 13 during midday hours, awareness of these levels is essential for preventing sunburn and protecting skin health. In a region characterized by strong sunlight, particularly from 10 AM to 2 PM, grasping the significance of UV exposure can help you take proactive steps to enjoy the beautiful outdoors safely. Whether you’re exploring the stunning landscapes or soaking up the sun, knowing the UV Index can empower you to keep your skin healthy and safeguard against harmful effects.
The UV Index throughout the day showcases a dynamic pattern of sun exposure. Starting off gently at 7:00 AM with a max of 2, the index climbs steadily, hitting 4 at 8:00 and surging to a striking 8 by 9:00 AM. The peak intensity occurs at 11:00 and 12:00 PM, where it reaches a blistering 13, indicating a significant risk for unprotected skin. As the afternoon progresses, the UV levels taper off, descending to 5 at 3:00 PM, then sliding down to 1 by 6:00 PM, and finally dropping to 0 by 7:00 PM. This data emphasizes the importance of sun safety measures, especially during the midday hours when the sun’s rays are at their most potent.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 11 | extreme | 10 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 5 | moderate | 30 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 |
The UV Index exhibits significant seasonal fluctuations throughout the year, with peak levels occurring from February to October. This period features extreme exposure categories, particularly from March through October, where the UV Index remains at 12 or higher, indicating a burn time of just 10 minutes. High-risk months include February, March, April, May, June, July, August, September, and October, all of which pose increased risk for skin damage. Residents and visitors are advised to take precautions during these months by wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sunlight hours to minimize UV exposure and protect their skin health. As the year progresses, levels decrease in November and December, returning to a very high exposure category, reminding individuals to stay vigilant even during the cooler months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hanoi UVI | 8 | 10 | 12 | 12 | 13 | 12 | 12 | 13 | 13 | 11 | 9 | 7 |
| Haiphong UVI | 8 | 10 | 12 | 13 | 12 | 13 | 13 | 13 | 13 | 11 | 9 | 7 |
| Ngu Hanh Son | 10 | 12 | 14 | 15 | 14 | 13 | 14 | 14 | 13 | 12 | 10 | 9 |
| Da Nang UVI | 10 | 12 | 14 | 15 | 14 | 13 | 14 | 14 | 13 | 12 | 10 | 9 |
| Ho Chi Minh City UVI | 10 | 13 | 15 | 14 | 14 | 12 | 13 | 14 | 13 | 13 | 11 | 10 |
| Bien Hoa UVI | 10 | 14 | 15 | 15 | 14 | 13 | 14 | 14 | 13 | 12 | 11 | 10 |