Last updated: July 2, 2025
In Nga Sau, Vietnam, understanding the UV Index is crucial for ensuring skin health and preventing sunburn. With typical UV exposure risks peaking between 10 AM and 2 PM, residents and visitors alike must stay informed about daily UV levels to protect themselves from harmful effects. The climate in Nga Sau, characterized as tropical, contributes to elevated UV levels, particularly during midday when the index can reach as high as 13. By staying aware of the UV Index, you can enjoy the sun safely and maintain healthy skin throughout the year.
The UV Index data reveals a dynamic fluctuation throughout the day, peaking at a maximum of 13 around noon. The morning starts off gently, with readings of only 1 at 07:00 and 3 by 08:00, perfect for early risers. However, as the sun ascends, the intensity rises sharply, hitting a critical 10 by 10:00 and reaching its zenith at 12 by 11:00 and 13 by 12:00. The afternoon sees a gradual decline, with values dropping to 9 at 14:00, and then further sliding to 6 by 15:00. As evening approaches, the UV Index dwindles to 3 by 16:00, and finally tails off to 1 by 17:00, nurturing a calmer end to the day. With clear awareness of these fluctuations, individuals can effectively plan their outdoor activities, ensuring protection during the most intense hours.
| 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 | 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 |
| Bien Hoa UVI | 10 | 14 | 15 | 15 | 14 | 13 | 14 | 14 | 13 | 12 | 11 | 10 |
| Nga Sau | 10 | 13 | 15 | 14 | 14 | 13 | 13 | 14 | 14 | 13 | 11 | 10 |