Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Cho Lach, Vietnam, where the tropical climate brings high levels of ultraviolet radiation. With peak UV levels reaching a staggering 13 around noon, it's essential to be aware of daily variations to protect against sunburn and long-term skin damage. The region's warm, sunny days present significant exposure risks, making it imperative to monitor UV levels for effective sun safety. By keeping an eye on the UV Index, you can enjoy the vibrant outdoor lifestyle of Cho Lach while prioritizing your skin health and overall well-being.
At 07:00, the UV Index starts off gently at 1, making it a safe time for morning activities. By 08:00, it rises to 3, indicating moderate levels of UV radiation. The sun begins to assert its dominance by 09:00, with the index climbing to 7, pushing outdoor enthusiasts to seek shade. 10:00 marks a significant peak at 10, and by 11:00, it reaches 12—a dangerous level where sun protection becomes crucial. The highest point occurs at 12:00, with the UV Index soaring to 13, suggesting that even brief exposure can lead to skin damage. From 13:00 to 14:00, it gently decreases to 12 and 9, respectively, but still warrants caution. As afternoon fades into evening, the index tapers off, dropping to 6 at 15:00 and further down to 3 by 16:00. Finally, the sun's intensity dwindles in the early evening, with indices falling to 1 by 17:00, 1 at 18:00, and reaching a low of 0 by 19:00. Plan your outdoor activities wisely to stay safe under the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 13 | 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 experiences significant changes, particularly peaking in the first half. January starts with a UV Index of 10, categorized as very high, where a burn can occur in just 15 minutes. However, the intensity escalates dramatically from February to April, with the UV Index reaching a maximum of 15 in March, classified as extreme, necessitating vigilance as burn times shrink to just 10 minutes. This high-risk period continues through May, June, July, and into August, with similar UV levels persisting and caution advisable. As the year progresses into the fall, the UV Index remains elevated, particularly in September and October, yet begins to taper off by November and December with a return to very high levels but longer burn times of 15 minutes again. Visitors and residents are advised to take necessary precautions—such as wearing sunscreen, protective clothing, and seeking shade—especially during the peak months from February to October when UV exposure poses a greater risk.
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 |
| 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 |
| Cho Lach | 10 | 13 | 15 | 14 | 14 | 13 | 13 | 14 | 14 | 13 | 11 | 10 |
| Bien Hoa UVI | 10 | 14 | 15 | 15 | 14 | 13 | 14 | 14 | 13 | 12 | 11 | 10 |