Last updated: July 2, 2025
In Koesan, South Korea, being aware of the UV Index is crucial for protecting your skin and maintaining overall health. Understanding UV levels not only helps prevent sunburn but also plays a vital role in reducing the long-term risks associated with skin damage. With Koesan's Dwa climate, residents and visitors experience significant UV exposure, especially during peak hours when the index reaches its highest levels of 11 between noon and 1 PM. Staying informed about these UV fluctuations empowers you to take the necessary precautions and enjoy the sun safely.
The UV Index for today shows a significant rise as the day progresses, peaking around 12:00 PM when it reaches a high of 11, indicating very high UV exposure. This is preceded by an increase from 1 at 07:00 to 10 by 11:00, where sun exposure becomes particularly intense. Following the midday peak, the UV Index gradually declines, dropping to 2 by 17:00 and returning to 1 as dusk approaches, making the morning and early afternoon the most critical times for sun safety. If you're heading out, remember to wear sunscreen and protective clothing, especially during the 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 | 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 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, peaking during the summer months. January and February show moderate levels of UV exposure (Index 3-4), with a burn time of 30 minutes, suggesting that while sun safety is recommended, the risk is lower. However, from March onward, the risk increases notably, reaching a high index of 6 in March and escalating to very high levels (Index 9) in April and May, where burn times drop to just 15 minutes. The summer months of June, July, and August present extreme conditions, with an Index of 11 and a mere 10-minute burn time, marking these as high-risk months. As temperatures begin to cool in September, the Index remains high at 10 before decreasing in October to 7 and returning to moderate levels by November and December. Residents and visitors should exercise heightened caution and employ sun protection measures during the spring and summer months, particularly when the UV Index exceeds 6, to prevent harmful sun exposure.
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 |
| Koesan | 3 | 4 | 6 | 9 | 9 | 11 | 11 | 11 | 10 | 7 | 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 |