Last updated: June 2, 2025
Understanding the UV Index in Bayan, Mongolia is essential for protecting your skin and ensuring overall health. With a climate categorized as BSk, residents and visitors alike face unique challenges when it comes to sun exposure. The UV levels can peak remarkably high, especially around noon with indexes reaching up to 9, significantly increasing the risk of sunburn and long-term skin damage. By staying informed about daily UV levels, you can take proactive measures to safeguard against harmful rays, allowing you to enjoy the beauty of Bayan while prioritizing your skin's health.
As the sun rises, the UV Index begins to climb, starting at a gentle 2 at 07:00. By 08:00, it reaches 3, hinting at a bright day ahead. The intensity peaks at 12:00, hitting an impressive 9, signaling that it's crucial to take sun safety measures during these hours. The UV Index remains elevated at 8 until 14:00, before gradually descending to 4 by 16:00. As the afternoon fades into evening, the index drops to a comfortable 1 by 18:00 and remains there until 19:00. Overall, it’s a day where sun protection is key, especially from late morning to early afternoon when the UV rays are at their strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Seasonal UV changes highlight a significant increase in UV exposure from winter to summer. January and February present low to moderate UV levels, with burn times ranging from 30 to 45 minutes. However, by March and April, the UV Index escalates to moderate and high levels, respectively, with increased caution advised. The months of May through August are particularly high-risk, marked by very high UV levels (Indices 8-9) and a dangerously short burn time of just 15 minutes. As we transition into September, the UV Index drops to high but still poses a risk, while October through December return to low UV levels. Visitors and residents should prioritize sun safety measures during the high-risk months of May to August, including wearing sunscreen, protective clothing, and seeking shade, to minimize the risk of sunburn and long-term skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Darhan UVI | 1 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Erdenet UVI | 2 | 3 | 5 | 7 | 8 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Bayan | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 9 | 6 | 4 | 2 | 2 |
| Ulan Bator UVI | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 9 | 6 | 4 | 3 | 1 |
| OElgii UVI | 2 | 3 | 5 | 7 | 10 | 9 | 9 | 9 | 7 | 5 | 2 | 1 |
| Khovd UVI | 2 | 3 | 6 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 1 |