Last updated: July 2, 2025
Understanding the UV Index is crucial for anyone spending time in Jeju City, South Korea. With its temperate Cfa climate, residents and visitors alike are often exposed to varying levels of ultraviolet radiation throughout the day. The UV levels in Jeju can peak dramatically, reaching as high as 12 between 12 PM and 1 PM, raising the risk of sunburn and long-term skin health issues. Being aware of these levels is not just about preventing painful sunburns; it’s also essential for maintaining healthy skin and reducing the risk of skin cancer. Stay informed and protect yourself while enjoying the beautiful outdoors of Jeju!
Experience a sunny day with fluctuating UV Index levels! Starting from a gentle 1 at 07:00, the intensity gradually climbs to reach a peak of 12 at both 12:00 and 13:00. As the sun rises higher, the UV Index hits a striking 11 at 11:00 and 14:00, indicating a need for protective measures. After 15:00, the levels start to decline, dropping to 5 by 16:00 and returning to a mild 1 by 18:00. Plan your outdoor activities wisely and remember, from 10:00 to 14:00, the sun's rays are at their strongest!
| 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 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 8 | very high | 15 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, UV exposure in this region varies significantly, with the highest risk months occurring from June to August, when the UV Index peaks at 12, indicating an extreme exposure category and a burn time of just 10 minutes. April and May also present a high risk with UV Index levels of 9 and 10, respectively, and significantly reduced burn times of 15 minutes. Conversely, the months of January and December exhibit a moderate UV Index of 4, allowing for longer burn times of 30 minutes. Visitors and residents should prioritize sun safety during the high-risk months by wearing protective clothing, applying sunscreen regularly, and seeking shade during peak hours, particularly between late spring and summer when UV levels are most dangerous.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Incheon UVI | 3 | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 9 | 6 | 4 | 3 |
| Seoul UVI | 3 | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 9 | 6 | 4 | 3 |
| Daejeon UVI | 3 | 5 | 7 | 9 | 9 | 11 | 11 | 12 | 10 | 7 | 5 | 3 |
| Daegu UVI | 3 | 5 | 7 | 10 | 10 | 11 | 12 | 12 | 10 | 7 | 5 | 3 |
| Busan UVI | 4 | 5 | 7 | 10 | 10 | 11 | 12 | 12 | 10 | 7 | 5 | 3 |
| Jeju City | 4 | 6 | 7 | 9 | 10 | 11 | 12 | 12 | 10 | 7 | 6 | 4 |