Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Seosan, South Korea, where the warm Cfa climate brings generous sunshine year-round. Being aware of UV levels helps prevent sunburn and protects skin health, especially during peak exposure times when the index can soar to 11—a level that signifies extreme risk. With typical UV exposure peaking between 12:00 PM and 1:00 PM, this knowledge is vital for planning outdoor activities and ensuring safety under the strong sun. Stay informed, protect your skin, and enjoy the beauty of Seosan with confidence!
The UV Index shows a dramatic rise as the sun climbs in the sky, peaking at 11 between noon and 1 PM, indicating an exceptionally high risk of harm from unprotected sun exposure. Starting the day low at a mere 1 at 7 AM, it steadily increases to 3 and then 5 by 9 AM, setting the stage for the intense midday sun. As it reaches 10 at 11 AM, it signals to outdoor enthusiasts to seek shade or don protective gear. The index begins to wane after 1 PM, dropping to 10 at 2 PM, and declining further to 3 by 5 PM, before settling back to 1 after 6 PM. To stay safe under the scorching sun, be sure to take precautions during those peak hours!
| 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 | 7 | high | 25 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 | 7 | high | 25 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, the UV Index exhibits notable seasonal changes, with the highest levels occurring during the summer months. January and February show a moderate UV Index of 3 and 4 respectively, allowing 30 minutes of safe sun exposure. As spring approaches, values rise significantly, peaking in April and May at a very high index of 8 and 9, respectively, where burn time reduces to just 15 minutes. The extreme UV Index of 11 in July and August demands even greater caution, as burn time drops to 10 minutes. As autumn arrives, the index tapers off to 9 in September and 7 in October, with safe exposure times of 15 and 25 minutes, respectively. The remaining months, November and December, return to a moderate level of 5 and 3, allowing for 30 minutes of safe sun exposure. Visitors and residents should be particularly vigilant during the summer months (June through August) and wear appropriate sun protection to minimize the risk of skin damage.
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 |
| Seosan | 3 | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 9 | 7 | 5 | 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 |