Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Na Khu, Thailand, where the tropical climate brings intense sun exposure throughout the day. Being aware of UV levels can significantly impact your skin health, helping to prevent sunburn and long-term skin damage. With peak UV readings reaching as high as 15 around noon, it's essential to stay informed and take necessary precautions, especially during the hottest hours. In Na Khu, the combination of its warm Aw climate and elevated UV index increases the risk of harmful effects from the sun, making sun safety a top priority for everyone enjoying this beautiful region.
The UV Index shows a dramatic rise throughout the morning, reaching its peak of 15 at 12:00 PM, signaling a highly intense sun exposure risk. Starting from a mild 1 at 07:00 AM, the index climbs steadily, hitting 13 at 11:00 AM and then slightly dipping to 11 by 2:00 PM. After the zenith of midday, there’s a gentle decline post-1 PM, dropping to 4 by 4:00 PM, before settling back to a low 1 after 5:00 PM. For anyone outdoors, it's crucial to stay protected during the peak hours of 10:00 AM to 2:00 PM when the UV Index reaches its most dangerous levels. Remember: sunscreen, shade, and protective clothing are your best friends during these hours!
| 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 | 11 | extreme | 10 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 15 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | 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 shows significant fluctuations, indicating varying levels of sun exposure risk. From January to April, UV levels rise sharply, peaking in April at an index of 15, defining it as a month with extreme exposure risk; similar levels prevail in July. The months of February, March, April, June, July, August, September, and October all demonstrate extreme ratings, suggesting that ten minutes of unprotected exposure can lead to sunburn. Notably, February, March, April, and July are the highest-risk months with indices at 12 or above. Conversely, November and December experience a drop to very high ratings at 10 and 9, respectively, where 15 minutes of exposure could result in burns. To protect yourself, it is essential for both visitors and residents to take necessary precautions during high UV months, such as seeking shade, wearing protective clothing, and applying sunscreen regularly.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mueang Nonthaburi UVI | 10 | 12 | 14 | 13 | 14 | 13 | 14 | 14 | 13 | 12 | 9 | 8 |
| Samut Prakan UVI | 10 | 12 | 14 | 13 | 14 | 13 | 14 | 14 | 13 | 12 | 9 | 8 |
| Bangkok UVI | 10 | 12 | 14 | 13 | 14 | 13 | 14 | 14 | 13 | 12 | 9 | 8 |
| Udon Thani UVI | 9 | 11 | 13 | 14 | 14 | 13 | 14 | 14 | 14 | 12 | 10 | 9 |
| Chon Buri UVI | 10 | 13 | 14 | 14 | 14 | 13 | 14 | 14 | 13 | 13 | 10 | 9 |
| Na Khu | 9 | 12 | 14 | 15 | 14 | 13 | 15 | 14 | 14 | 12 | 10 | 9 |