Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Bayan, Mongolia, where exposure to harmful ultraviolet rays can significantly impact skin health. With UV levels that peak at a striking 9 around midday, being aware of these fluctuations is essential for preventing sunburn and long-term skin damage. The unique BSk climate of Bayan, characterized by its dry, continental conditions, results in intense sun exposure, especially during summer months. Stay informed about the UV Index to protect yourself and enjoy the outdoors safely!
The UV Index data reveals a fascinating daily pattern in sun exposure. Starting at 07:00, the UV Index is a modest 1, perfect for early risers. As the day progresses, conditions warm up significantly; by 10:00, the Index reaches 7, signaling a time for caution. Peak intensity arrives at 12:00, with the Index hitting an impressive 9—a clear indication to seek shade and don protective gear. The high point remains consistent until 14:00, where it stays at 9. As the afternoon unfolds, the intensity dips slightly, falling to 7 by 15:00 and gradually declining to 1 by 19:00. This pattern highlights the importance of being sun-smart, especially during those midday hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 4 | 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 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index varies significantly, indicating seasonal changes in UV radiation. From January to March, UV levels are generally low to moderate, with the highest burn time of 45 minutes in January and a moderate level of 30 minutes in February and March. April marks the beginning of higher risk, with a UV Index of 7 and a burn time of 25 minutes. The peak risk months are May to August, where the UV Index reaches 10, requiring only 15 minutes of sun exposure before risking skin damage. September sees a decrease to 7, while October and November return to moderate levels of 30 minutes of burn time. Meanwhile, December's UV Index drops back to 2, indicating low exposure risk again. Visitors and residents should take precautions from April through August, such as wearing sunscreen, hats, and protective clothing, to minimize their risk of UV-related harm.
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 |
| 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 |
| Bayan | 2 | 3 | 5 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 3 | 2 |