Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Si Sawat, Thailand, where the sun's rays can be particularly intense. With temperatures soaring in this tropical climate, awareness of UV levels helps prevent sunburn and long-term skin health issues such as premature aging and skin cancer. During peak hours, typically between 10 AM and 2 PM, the UV Index can reach a maximum of 14, indicating an extreme risk of harm from unprotected sun exposure. By staying informed and taking proactive measures, you can enjoy the beautiful outdoors while safeguarding 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 shows significant seasonal variations, with extreme levels persisting from January to September. The highest index of 15 occurs in August, indicating that this month, along with July and June, presents the greatest risk for sunburn, with a burn time of just 10 minutes. As autumn approaches, the UV Index gradually decreases, falling to 10 in November and 9 in December, which are still categorized as very high, allowing for a slightly longer burn time of 15 minutes. Residents and visitors need to remain vigilant during high-risk months, especially from February through September, ensuring proper sun protection measures are taken to minimize the risk of skin damage. Regular application of sunscreen, wearing protective clothing, and seeking shade are essential strategies during these months.
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 |
| Si Sawat | 11 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 14 | 13 | 10 | 9 |