Last updated: July 2, 2025
In Sap Yai, Thailand, awareness of the UV Index is crucial for maintaining skin health and preventing sunburn. Understanding UV levels helps residents and visitors alike take necessary precautions against harmful sun exposure, especially during peak hours when the index reaches a maximum of 14. With Sap Yai's tropical climate, where the sun shines brightly, the risk of skin damage increases significantly from late morning to early afternoon. By staying informed about the UV Index, you can better protect yourself and enjoy the beautiful sunny days Sap Yai has to offer!
The UV Index paints a vivid picture of the sun's intensity as the day progresses. Morning kicks off with a low index of 1 at 07:00, a gentle start that quickly picks up momentum. By 09:00, it reaches 6, hinting that it’s time to consider some sun protection. The peak occurs at 12:00, when the index skyrockets to 14, indicating exceptionally high UV levels—perfect for keeping those sunscreen bottles handy! As the afternoon rolls in, the index begins to taper off, dropping to 11 at 14:00 and descending steadily thereafter. By evening, the UV Index dwindles to 0 at 19:00, inviting everyone to unwind as the sun retreats. This data serves as a reminder to stay vigilant under the midday sun and enjoy the outdoors while being sun-smart!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 14 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV levels display notable seasonal changes, reaching their peak from March to October, where the UV Index consistently registers between 13 and 14, categorized as extreme. The highest risk months are February through September, with a maximum UV Index of 14 in March, April, July, August, and September, indicating a burn time of just 10 minutes for unprotected skin. During January, November, and December, while still categorized as very high, the UV Index decreases to 9 and 10, allowing for a slightly longer burn time of 15 minutes. Visitors and residents are strongly advised to take precautions during the peak months by wearing protective clothing, applying broad-spectrum sunscreen frequently, and seeking shade when the sun is strongest, typically between 10 a.m. and 4 p.m. to minimize the risk of skin damage.
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 |
| Sap Yai | 9 | 12 | 14 | 14 | 14 | 13 | 14 | 14 | 14 | 13 | 10 | 9 |
| Chon Buri UVI | 10 | 13 | 14 | 14 | 14 | 13 | 14 | 14 | 13 | 13 | 10 | 9 |