Last updated: June 2, 2025
Understanding the UV Index in Sergelen, Mongolia is crucial for maintaining skin health and preventing sunburn, especially given the region's semi-arid BSk climate. With UV levels peaking at a high of 10 during midday hours, awareness of these fluctuations can help residents and visitors alike make informed decisions about sun protection. Knowing when it's safest to be outdoors not only reduces the risk of skin damage but also promotes healthier habits in this beautiful locale marked by its unique climatic challenges. Stay vigilant and protect your skin while enjoying all that Sergelen has to offer!
The UV Index throughout the day reveals a clear pattern of increasing intensity under the sun. Starting the morning at a moderate level of 2 at 07:00, the index gradually rises to a notable 3 by 08:00. By 09:00, it reaches a peak of 5, but the real intensity hits as it climbs to a significant 7 at 10:00. The sun’s potency peaks around 12:00, soaring to a maximum of 10, with this level sustained until 13:00. As the afternoon unfolds, the intensity begins to wane, dropping to 9 by 14:00 and then tapering down to 7 at 15:00. The evening ushers in a gentle decline, with the UV Index falling to 3 at 17:00, and finally settling at a low 1 by 19:00. Always remember to protect your skin, especially during peak hours when UV exposure is at its highest!
| 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 | 9 | very high | 15 min |
| 12:00 | 10 | 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 | 2 | 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 |