Last updated: July 2, 2025
Understanding the UV Index is vital for the residents and visitors of Sayn-Ust, Mongolia, where the unique semi-arid climate (BSk) can lead to significant sun exposure. With a maximum UV Index reaching up to 9 at midday, awareness of UV levels is essential for preventing sunburn and protecting overall skin health. The risk of harmful effects from UV rays rises sharply around midday, making it crucial to plan outdoor activities accordingly. By staying informed about daily UV fluctuations, you can enjoy the sunny climate of Sayn-Ust while safeguarding your skin against potential damage.
The UV Index peaks significantly throughout the day, starting with a low 1 at 07:00 and rapidly climbing as the sun rises. By 10:00, it reaches 6, indicating a moderate risk for harm, which escalates sharply to a high of 9 between 12:00 and 13:00. This substantial index signifies that precautions are necessary, especially with the sun at its strongest. As the afternoon progresses, the UV Index gradually declines, dipping to 5 by 16:00, and further tapering off to a mere 1 by 19:00. For those outdoors, staying protected during the peak hours is critical for skin health!
| 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 | 8 | 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, seasonal UV changes demonstrate a marked increase in intensity, peaking during the summer months. From January's UV Index of 2 (low exposure) to May and June, where it reaches 10 (very high), there's a significant risk for sunburn. The high-risk months are May through August, during which the UV Index consistently remains at 9 or higher, indicating that exposure can lead to severe skin damage in as little as 15 minutes. To protect themselves, visitors and residents are advised to utilize sunscreen, wear protective clothing, and seek shade during mid-day hours from May to August. As autumn approaches, UV levels decrease, but caution is still recommended in September with a UV Index of 7.
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 |
| Sayn-Ust | 2 | 3 | 5 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 2 |
| Khovd UVI | 2 | 3 | 6 | 7 | 10 | 10 | 9 | 9 | 7 | 5 | 2 | 1 |