Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Haylaastay, Mongolia, where the BSk climate brings unique challenges in sun exposure. With UV levels peaking in the midday hours—reaching a significant 9—awareness of these fluctuations is vital for preventing sunburn and safeguarding your skin health. As the sun sits high in the sky, especially between 10:00 AM and 2:00 PM, it's important to take precautions to enjoy the outdoors safely while minimizing risks associated with excessive UV radiation. Stay informed and protect yourself against potential harm as you navigate the vibrant landscapes of Haylaastay!
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 |
Throughout the year, the UV Index exhibits significant seasonal fluctuations that require careful attention from both residents and visitors. From January to February, the risk remains low to moderate, with burn times ranging from 30 to 45 minutes. However, as spring arrives and peaks in April with a high UV Index of 7, the risk escalates, necessitating more diligent sun protection. The summer months of May to August are particularly concerning, featuring a sustained very high index of 9 and a minimized burn time of only 15 minutes—the highest risk period. As September approaches, the index drops to 7, but caution should still be exercised. The UV levels fall again in October, settling to a moderate 4, and remain low through November and December. To ensure safety, especially during high-risk months (May through August), it is crucial to apply sunscreen, seek shade, and wear protective clothing.
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 |
| Haylaastay | 2 | 3 | 5 | 7 | 9 | 9 | 9 | 9 | 7 | 4 | 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 |