Last updated: June 2, 2025
Understanding the UV Index in Bayan, Mongolia is crucial for safeguarding your skin and overall health. With its Dwc climate, residents and visitors alike face varying levels of UV exposure throughout the day, peaking at a significant UV Index of 9 during midday hours. Recognizing these levels is essential for effective sunburn prevention—especially in a region where sunny days are common. By being aware of UV risks, you can take proactive steps to protect your skin, ensuring your outdoor activities remain safe and enjoyable under the Mongolian sun.
As the day dawns, the UV Index begins its ascent, starting at a gentle 1 by 7:00 AM. By 9:00 AM, it noticeably climbs to 4, signaling a more moderate level of sun exposure. The sun reaches its zenith at 12:00 PM, peaking at a robust 9, where precautions become essential. This level remains steady until 2:00 PM, encouraging outdoor enthusiasts to stay sun-safe. As the afternoon wanes, the UV index gradually declines, dipping to 6 by 4:00 PM, before settling back down to 1 by 7:00 PM. Early risers can begin enjoying the outdoors as conditions remain more forgiving in the morning, but midday calls for vigilance to protect your skin from the sun’s strongest rays.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | 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 | 9 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV exposure fluctuates significantly, with the highest risk months occurring from May to August, when the UV Index peaks at 9—classified as very high—resulting in a reduced burn time of just 15 minutes. In contrast, during the winter months of January, November, and December, the UV Index falls to 2, indicating low exposure risk and allowing for a safer 45-minute burn time. As spring transitions to summer in April and May, caution is advised as UV levels climb from high to very high. To promote safety, visitors and residents should take protective measures, such as wearing sunscreen and seeking shade, especially between April and August, when sun exposure can be most harmful. Remember, even on cloudy days, UV rays can penetrate, so it's wise to stay vigilant year-round.
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 |
| Ulan Bator UVI | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 9 | 6 | 4 | 3 | 1 |
| Bayan | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 9 | 7 | 5 | 2 | 2 |
| 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 |