Last updated: July 2, 2025
In Bayan, Mongolia, awareness of the UV Index is crucial for safeguarding skin health and preventing sunburn, especially given the region's BSk climate, characterized by sharp temperature fluctuations and significant sun exposure. Understanding the UV levels throughout the day helps residents and visitors alike make informed decisions about sun protection, particularly during peak hours when values can soar to 9 between noon and 2 PM. Embracing this knowledge not only enhances well-being but also fosters a culture of health consciousness amidst Bayan's vibrant but sun-drenched environment.
As the sun rises, the UV Index begins its journey, peaking at 9 between 12:00 PM and 2:00 PM, indicating a strong risk of harm from unprotected sun exposure. Early in the morning, at 7:00 AM, the index starts low at only 1, making it safer for outdoor activities. By 9:00 AM, it increases to a moderate 4, prompting some sun safety precautions. The intensity intensifies, hitting 8 by 11:00 AM and 6 at 10:00 AM, urging those out and about to seek shade. As the afternoon progresses, the UV Index begins to taper off, decreasing to 7 at 3:00 PM, and down to 5 at 4:00 PM, signifying a safer end to the day. By 5:00 PM, it drops to 3, and by sunset at 7:00 PM, it returns to a minimal 1. Stay vigilant and protect your skin during the peak 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 | 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 | 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 experiences significant fluctuations, indicating varying levels of sun exposure risk. High-risk months include April to August, where the UV Index reaches its peak at 10 in June and remains between 9 and 7 for the subsequent months. During these periods, the burn time dramatically decreases to just 15 minutes, underscoring the importance of protection against harmful UV rays. In contrast, the months of January, November, and December present a much lower risk, with UV indices of 2 and burn times extending to 45 minutes. To ensure safety during high UV periods, visitors and residents should prioritize sun protection strategies, including wearing sunscreen, hats, and protective clothing, and seeking shade during peak hours.
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 |
| Bayan | 2 | 3 | 5 | 7 | 9 | 10 | 9 | 9 | 7 | 5 | 2 | 2 |
| Khovd UVI | 2 | 3 | 6 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 1 |