Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Sergelen, Mongolia, where the combination of a BSk climate and high-altitude sun exposure can significantly elevate UV radiation levels. Awareness of daily UV levels helps in preventing sunburn and maintaining skin health, allowing you to enjoy the outdoors safely. The UV Index typically peaks between 11:00 AM and 1:00 PM, reaching levels as high as 10, which indicates a very high risk of harm from unprotected sun exposure. By staying informed about these risks, you can take appropriate precautions and protect your skin while enjoying the beautiful Mongolian landscapes.
The UV Index throughout the day paints a striking picture of sun intensity, peaking at 10 between 1:00 PM and 2:00 PM—the optimal time for sun safety. Starting the day with a modest 1 at 7:00 AM, the index gradually escalates, reaching highest levels at 12:00 PM with a reading of 9 and hitting its zenith at 1:00 PM. As the afternoon progresses, the UV Index dips, settling back to 7 by 3:00 PM and finally dropping to a low of 1 as evening approaches, with readings of 3 at 5:00 PM and 1 after 6:00 PM. This data serves as a timely reminder to protect your skin during the peak hours of sun exposure!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | 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 | 10 | 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 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences notable changes, significantly impacting visitors and residents. Low-risk months occur in January, November, and December, where the UV Index is between 2 and exposure time is safe for up to 45 minutes. As spring arrives, February and March see a moderate risk (UV Index 3 and 5), and ideal exposure times shorten to 30 minutes. The high-risk months are from April to August, with the UV Index peaking at 10 in June and July, emphasizing a very high exposure category where the burn time drastically decreases to just 15 minutes. As summer wanes into September, the index drops to 7, indicating a high risk with a safer 25-minute burn time. By October, conditions moderate again, but caution is still advised, especially during the transition months in spring and summer when UV levels are at their peak. Visitors and residents are encouraged to take necessary precautions, such as applying sunscreen, wearing protective clothing, and seeking shade during peak hours, particularly from May to August.
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 |
| Sergelen | 2 | 3 | 5 | 7 | 9 | 10 | 10 | 9 | 7 | 5 | 2 | 2 |
| Khovd UVI | 2 | 3 | 6 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 1 |