Last updated: June 2, 2025
In Thimphu, Bhutan, being aware of the UV Index is crucial for safeguarding your skin against the harmful effects of sun exposure. Understanding UV levels not only helps in preventing painful sunburns but also plays a significant role in long-term skin health. Nestled in a Cwb climate zone, Thimphu experiences varied UV exposure throughout the day, reaching a peak of 16 around noon when protective measures are most essential. With UV levels fluctuating dramatically—from a mild 2 in the early morning to a striking 15 by mid-day—it's vital for residents and visitors alike to stay informed about the UV Index to enjoy the sun safely and sustainably.
As the sun rises, the UV Index begins its ascent, starting from a gentle 2 at 07:00. By 08:00, it climbs to 5, prompting a little extra sun protection as daylight beckons. The intensity picks up remarkably, reaching 8 by 09:00, and hitting its peak at 12:00 with a scorching 16. The afternoon sees a slight decline, with values of 15 at 13:00 and 12 at 14:00, reminding us to seek shade and hydration. As the day winds down, the intensity drops significantly, falling to 4 at 16:00, 2 at 17:00, and fading to 1 by 18:00, before finally resting at 0 after 19:00. These figures illustrate the importance of being sun-smart during those midday hours when UV exposure is at its highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 12 | extreme | 10 min |
| 11:00 | 15 | extreme | 10 min |
| 12:00 | 16 | extreme | 10 min |
| 13:00 | 15 | extreme | 10 min |
| 14:00 | 12 | 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 |
Throughout the year, UV exposure significantly varies, with the highest UV Index levels occurring from March to October. During this peak period, particularly in April, May, June, July, and August, the UV Index reaches extreme levels (14-16), requiring only 10 minutes of sun exposure before burning occurs. Visitors and residents should take extra precautions during these months, including wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade when necessary. The high-risk months are February through October, with the most critical months in April and May. As the year progresses, the UV Index gradually decreases, dropping to very high levels in November and high in December, where burn times increase to 15 and 25 minutes, respectively. Staying informed and protected is crucial for everyone's health throughout all seasons.
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 |
| Punakha UVI | 8 | 10 | 12 | 14 | 15 | 15 | 16 | 15 | 14 | 11 | 9 | 6 |
| Thimphu | 8 | 10 | 13 | 14 | 16 | 16 | 16 | 15 | 14 | 12 | 9 | 7 |