Last updated: July 2, 2025
Understanding the UV Index in Kuji, Japan is essential for protecting your skin and overall health, especially given the area's temperate climate, classified as Cfb. As UV levels can soar, peaking at a significant 10 around midday, awareness is crucial for preventing sunburn and minimizing long-term skin damage. By monitoring the UV Index, residents and visitors alike can take proactive measures to shield themselves from harmful rays, ensuring a safer and more enjoyable experience in the sun. Whether you're enjoying outdoor activities or simply soaking in the natural beauty of Kuji, being informed about UV exposure can make all the difference.
The hourly UV Index paints a clear picture of the day's intensity from morning to evening. Starting at a mild 3 at 7:00 AM, the day warms up quickly, peaking at a robust 10 between 11:00 AM and 12:00 PM—the perfect time to seek shelter or apply sunscreen. After that fleeting high, the UV Index gradually declines, dropping to 4 by 3:00 PM and further diminishing to 1 by 5:00 PM. As the sun sets, the UV levels plummet to a safe 0 by 7:00 PM. This data underscores the importance of protecting your skin during peak hours, especially when the sun is at its strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV radiation levels experience significant seasonal variation, peaking during the summer months. January and December have a low UV Index of 2, allowing for an extended burn time of 45 minutes. However, as early as February, the UV Index rises to 3 (moderate), reducing the burn time to 30 minutes. March introduces a high risk with a UV Index of 6, and by April and May, it escalates to 8 and 9 respectively, both categorized as very high, with a critical burn time of just 15 minutes. The peak occurs in August, where the UV Index reaches an extreme level of 11, permitting only 10 minutes of exposure before risking sunburn. As we transition into fall, the UV levels moderate slightly, but September remains high at 9, before dropping back to a high index of 6 in October. As a precaution, visitors and residents should prioritize sun protection from March through September, particularly during the summer months when the risk of harm is greatest, and always use sunscreen, wear protective clothing, and seek shade during peak hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sapporo UVI | 2 | 3 | 6 | 7 | 9 | 9 | 9 | 10 | 8 | 5 | 3 | 2 |
| Kuji | 2 | 3 | 6 | 8 | 9 | 10 | 10 | 11 | 9 | 6 | 4 | 2 |
| Yokohama UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Tokyo UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Nagoya UVI | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |