Last updated: August 1, 2025
In Bayanhoshuu, Mongolia, understanding the UV Index is crucial for protecting your skin and ensuring overall health. With UV levels soaring to a maximum of 10 during peak hours, awareness of sun exposure can significantly help in preventing sunburn and long-term skin damage. The region's Dwc climate offers distinct seasonal variations, yet the potential for high UV radiation remains a consistent risk. By tracking the UV Index, locals and visitors alike can enjoy the sunshine safely while prioritizing their skin health.
At dawn, the UV Index begins its climb, starting at a mild 1 at 07:00. As the sun rises higher, it steadily ascends, reaching 2 by 08:00 and escalating to 3 by 09:00. The peak of the day arrives at noon with a striking 9, just before it hits its maximum of 10 from 13:00 to 14:00, signifying a need for sun protection. The intensity begins to taper off after that, dropping to 9 at 15:00, then descending through 7 at 16:00, and winding down to 4 by 17:00. As evening approaches, the UV Index dwindles to 3 by 18:00 and finally returns to 1 by 19:00, illustrating the clear and powerful influence of the sun throughout the day.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 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 |
As the season progresses, the UV Index shows significant variation, impacting exposure risk for visitors and residents. January and December feature low UV levels (Index 2), allowing for safer sun exposure with burn times of 45 minutes. However, danger begins to rise in February (Index 3) and reaches a peak in May, where the UV Index soars to 11, marking the extreme category and reducing safe exposure time to just 10 minutes. The high-risk months, from April to August, require heightened awareness, with indices ranging from 9 to 11, indicating very high to extreme exposure. Visitors and residents are advised to take protective measures, such as wearing sunscreen, protective clothing, and hats, especially during these months, to ensure their safety under the sun. September through November see a tapering off of UV intensity, but precautions remain wise due to moderate indices.
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 |
| Bayanhoshuu | 2 | 3 | 6 | 9 | 11 | 10 | 10 | 10 | 7 | 5 | 3 | 2 |