Last updated: July 2, 2025
Understanding the UV Index in Sai Yok, Thailand is essential for maintaining skin health and preventing sunburn. With its warm, tropical climate, Sai Yok experiences varying UV exposure levels throughout the day, peaking at a high of 14 around noon. This rapid increase in UV intensity underscores the importance of being aware of UV levels, allowing residents and visitors alike to take proactive measures against harmful sun effects. By keeping an eye on the UV Index, you can enjoy the beautiful outdoors while protecting your skin from potential damage.
As the day breaks, the UV Index begins at a cautious 1 at 07:00, indicating low risk for sun exposure. By 08:00, it climbs to 3, prompting some to consider a light sunscreen. The intensity picks up significantly by 09:00 with a 5, warning us that the sun's rays are becoming more potent. At 10:00, the UV Index peaks at an exhilarating 9, signifying a very high risk of harm from unprotected sun exposure. The sun is at its strongest between 11:00 and 13:00, where it reaches a staggering 14, urging everyone to seek shade and lavish on the sunscreen. As the afternoon unfolds, the readings begin to descend, dropping to 12 at 14:00 and gradually tapering down to 8 at 15:00. The evening brings relief, with the Index falling to 5 by 16:00, and dwindling to 2 at 17:00. As daylight fades, the UV risk decreases to a safe 1 at 18:00 before finally retiring to 0 by 19:00. Stay sun-smart!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 14 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV index experiences significant seasonal fluctuations, maintaining extreme exposure levels from January to October, with values peaking at 14 in multiple months, indicating a burn time of just 10 minutes. From November onward, the index gradually decreases, transitioning to a very high rating, where the burn time extends to 15 minutes in both November and December. The highest-risk months are clearly the summer and early autumn months, from March to October, when the UV index is consistently at its peak. Visitors and residents are strongly advised to take protective measures, including wearing sunscreen, protective clothing, and seeking shade during peak sunlight hours to mitigate the risks associated with prolonged UV exposure.
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 |
| Sai Yok | 11 | 12 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 10 | 9 |