Last updated: June 2, 2025
Understanding the UV Index in Thanh Ha, Vietnam, is crucial for ensuring your skin's health and preventing sunburn. With its Cwa climate, the region experiences significant sunshine, particularly during midday hours when UV levels can soar as high as 12 between 11:00 AM and 1:00 PM. This means that being aware of the UV Index is not just a matter of comfort but a vital part of safeguarding against harmful effects from overexposure. Whether you're enjoying outdoor activities or simply spending time in your garden, knowing the UV exposure risks in Thanh Ha empowers you to take necessary precautions, like applying sunscreen or seeking shade, ensuring a healthier experience under the sun.
At sunrise, the UV Index begins at a gentle 2 by 07:00, but as the sun rises higher, the intensity quickly escalates. By 09:00, it reaches a moderate 7, signaling outdoor enthusiasts to apply sunscreen. The peak comes at 11:00 and 12:00, where the index peaks at a striking 12, indicating very high levels of UV radiation. As the afternoon progresses, the index gradually decreases, dipping to 8 by 14:00 and further dropping to 5 by 15:00. In the late afternoon and evening, the UV Index retreats to 3 by 16:00, finally settling at 1 by 17:00 and fading to 0 after 19:00. This daily cycle highlights the importance of sun safety during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 12 | 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 experiences significant seasonal fluctuations, peaking during the late summer months, particularly from April to October, where it remains consistently in the extreme category, with a maximum of 13. The highest risk months are March through October, when the burn time is reduced to just 10 minutes, making sun protection essential during these periods. Visitors and residents should take precautions, such as wearing broad-spectrum sunscreen, protective clothing, and sunglasses, especially during the hours of 10 a.m. to 4 p.m. When the UV Index is highest, consider seeking shade or limiting sun exposure to reduce the risk of skin damage. In contrast, the months of December and January present a lower risk with a burn time of 25 minutes and a high to very high exposure category, yet caution should still be exercised.
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 |
| Thanh Ha | 8 | 10 | 12 | 13 | 13 | 12 | 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 |