Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Jeju City, South Korea, where its Cfa climate brings warm summers and ample sunshine. Being aware of UV levels not only helps in preventing painful sunburns but also plays a vital role in maintaining overall skin health. On sunny days, Jeju's UV Index can reach a maximum of 11 around noon, signaling a high risk for unprotected skin. This makes it essential to monitor UV readings throughout the day, especially between 10 AM and 3 PM when exposure risks peak. Stay informed and protect your skin while enjoying the beautiful landscapes that Jeju has to offer!
As the sun rises, the UV Index begins to climb, starting at a gentle 1 at 07:00. By 08:00, it jumps to 3, signaling an increase in sun intensity. The real peak arrives as the clock strikes 11:00 with a robust 10, continuing to soar to a maximum of 11 at 12:00, where caution is advised—especially for those spending extended time outdoors. The afternoon sees a gradual decline, with the index lowering to 8 at 15:00, before dropping to 3 by 17:00. As the day winds down, the UV levels retreat to 1 from 18:00 onward, concluding a day of fluctuating sun exposure. To enjoy the outdoors safely, be mindful of those midday hours when sun protection is paramount!
| 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 | 10 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 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 |