Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Bayan, Mongolia, where the high-altitude climate can lead to increased sun exposure, especially during the peak hours of 11:00 AM to 3:00 PM. Awareness of UV levels helps in preventing sunburn and promotes better skin health by guiding individuals on how to protect themselves from harmful rays. With maximum UV Index values reaching 9 during the sunniest parts of the day, it’s essential to stay informed about the risks associated with the Dwc climate and to take appropriate measures to safeguard your skin while enjoying the beautiful outdoors.
The UV Index throughout the day showed a pronounced peak around midday, starting with a maximum reading of 1 at 7:00 AM. As the sun rose, the index climbed steadily, reaching 9 between 12:00 PM and 2:00 PM—the highest levels of the day, indicating a strong need for sun protection. The intensity began to taper off after 3:00 PM, with readings of 8 at 3:00 PM, dropping to 6 by 4:00 PM, and further decreasing to 1 by 7:00 PM. Overall, the UVI highlights the importance of sun safety during the peak hours, especially between 11:00 AM and 2:00 PM.
| 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 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 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 |