Last updated: July 2, 2025
Understanding the UV Index in Song Thao, Vietnam is crucial for safeguarding your skin and overall health. With the sun’s intensity peaking around noon, the risk of sunburn increases significantly, particularly when UV levels soar to 13 during the hottest hours. This tropical climate (Cwa) brings about high UV exposure, making it essential to stay informed about daily UV forecasts. By keeping a close eye on the UV Index, residents and visitors alike can take proactive measures to protect themselves, ensuring that outdoor activities remain enjoyable and safe.
The UV Index throughout the day presents a dynamic snapshot of sun intensity, peaking sharply at 12:00 PM with a striking UVI of 13. Morning hours start off gently, climbing from 2 at 07:00 to 6 by 09:00. As the sun reaches its zenith, the index escalates rapidly, hitting 10 by 10:00 and soaring to its maximum of 12 at 11:00 AM. This intensity persists until 1:00 PM, when it begins a gradual decline, dipping to 3 by 4:00 PM and dwindling to 0 by 7:00 PM. For anyone planning outdoor activities, it’s crucial to keep in mind that the highest risk of harm from UV exposure occurs during that midday peak, making sunscreen and protective measures essential in the hours leading up to, and immediately following, noon.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | 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 exhibits significant seasonal fluctuations, with January and February marking the start of very high UV levels (8 and 10, respectively) and a burn time of just 15 minutes. As we progress into March and April, the index escalates to an extreme level of 12, with a reduced burn time of 10 minutes, highlighting a critical time for sun safety. The peak risk months span from May to October, where the index reaches a sustained high of 13, continuing to warrant just 10 minutes of unprotected exposure before burn occurs. The UV levels begin to decline in November with a UV Index of 9, still classified as very high, before tapering off to a high of 7 in December with a burn time of 25 minutes. To ensure safety, it is essential for visitors and residents to wear protective clothing, apply sunscreen regularly, and seek shade during peak hours, especially from March to October when UV exposure is most intense.
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 |
| Song Thao | 8 | 10 | 12 | 12 | 13 | 13 | 13 | 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 |