Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Tsimasham, Bhutan, where the region's Cwa climate leads to varying levels of ultraviolet exposure throughout the day. As the sun's rays become more intense, especially between 10:00 AM and 2:00 PM, the risk of sunburn and long-term skin damage escalates. By staying informed about local UV levels, you can take proactive steps to protect your skin health. Whether exploring the stunning landscapes or enjoying outdoor activities, being aware of the UV Index ensures you can safely savor all that Tsimasham has to offer while minimizing sun-related risks.
The UV Index data reveals a dynamic range of sun exposure throughout the day, peaking dramatically from 07:00 to 15:00. Starting at a moderate 2 at 07:00, the index climbs steadily, reaching a substantial 15 by 12:00. The sun reaches its zenith at 11:00 with an impressive 14, before slightly declining to 11 by 14:00. As afternoon turns to evening, the index drops off progressively: 8 at 15:00, then down to 4 by 16:00. By 17:00, it's a mere 2, gently fading to a safe 0 by 19:00, marking the end of a sun-soaked day. Staying protected during those peak hours of 10:00 to 14:00 is crucial, as the sun shows its most intense face, urging everyone to seek shade and apply sunscreen.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 11 | extreme | 10 min |
| 11:00 | 14 | extreme | 10 min |
| 12:00 | 15 | extreme | 10 min |
| 13:00 | 14 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 8 | very high | 15 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 |
During the year, the UV Index varies significantly, with high-risk months typically from February to October, where the index reaches extreme levels of 11 and above. March through August are particularly concerning, with UV Index peaks at 15 during June, July, and August, indicating a very high risk for sunburn with a burn time of just 10 minutes. As UV exposure intensifies in these months, it is crucial for visitors and residents to take precautionary measures, such as wearing protective clothing, using sunscreen with a high SPF, and seeking shade, especially during midday hours. In contrast, January, November, and December present lower UV risks, albeit still warranting awareness due to their high UV Index of 7 and very high of 9. Staying vigilant throughout the year helps ensure safe outdoor activities.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phuntsholing UVI | 5 | 7 | 9 | 10 | 11 | 13 | 14 | 13 | 12 | 10 | 8 | 6 |
| Pemagatshel UVI | 6 | 8 | 10 | 13 | 13 | 14 | 15 | 14 | 13 | 11 | 8 | 6 |
| Tsirang UVI | 6 | 9 | 10 | 12 | 13 | 14 | 15 | 14 | 13 | 11 | 8 | 6 |
| Tsimasham | 7 | 9 | 11 | 13 | 14 | 15 | 15 | 15 | 13 | 11 | 9 | 7 |
| Punakha UVI | 8 | 10 | 12 | 14 | 15 | 15 | 16 | 15 | 14 | 11 | 9 | 6 |
| Thimphu UVI | 8 | 10 | 13 | 14 | 16 | 16 | 16 | 15 | 14 | 12 | 9 | 7 |