Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Bayan-Ulaan, Mongolia, where the climate is classified as Dwc, indicating cold, snowy winters and dry, warm summers. With peak UV levels reaching an alarming 10 around midday, awareness of these fluctuations is vital for sunburn prevention and long-term skin health. High UV exposure can lead to harmful effects, making it essential to monitor these levels, especially during the sunniest hours. Whether you're enjoying outdoor activities or just exploring the vibrant cityscape, being informed about UV risks will help you stay protected and healthy under the Mongolian sun.
The UV Index throughout the day showcases a notable rise, peaking at an impressive 10 between 1 PM and 2 PM. Starting from a mild 1 at 7 AM, sun lovers can expect a steady ascent, reaching 9 by noon. As the afternoon sun intensifies, the index holds a robust 10, signaling extreme UV exposure, before gradually tapering off to 4 by 5 PM and descending further to 1 by 7 PM. It's a classic reminder to stay protected during those peak hours, especially between 11 AM and 3 PM, when the sun's rays are most potent. Enjoy the sunshine, but don’t forget your sunscreen!
| 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 | 10 | very high | 15 min |
| 14:00 | 10 | 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, the UV Index exhibits significant seasonal changes, with the highest values occurring during the summer months. From April to August, the UV Index peaks at 10, indicating a very high risk of harm from unprotected sun exposure, with a critical burn time of only 15 minutes. Conversely, the winter months of January and December show a low UV Index of 2, allowing for safer, extended exposure up to 45 minutes. The high-risk months for sun exposure are clearly identified as April through August, recommending that both visitors and residents take extra precautions during this period. It is advisable to wear protective clothing, use sunscreen, and seek shade, especially when the sun is at its peak. As we transition into September and October, while the risk decreases to high and moderate categories respectively, it’s still essential to be vigilant against UV exposure.
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-Ulaan | 2 | 3 | 6 | 10 | 10 | 10 | 10 | 10 | 7 | 5 | 3 | 2 |