Last updated: August 1, 2025
Understanding the UV Index is crucial for residents and visitors in Kushimoto, Japan, where the subtropical climate presents unique sun exposure risks. With peak UV levels often soaring to 12 during midday, awareness of these levels can significantly aid in sunburn prevention and promote better skin health. As you navigate the sunny days typical of this region, being informed about UV radiation not only protects your skin but also enhances your overall well-being. Whether you’re enjoying the beautiful beaches or exploring local attractions, taking precautions against high UV levels is essential to keep your skin safe and healthy.
As the sun rises, the UV Index begins its climb, starting at a mild 2 at 07:00. By 08:00, it reaches a moderate 4, but the real intensity kicks in by 09:00 with a sharp jump to 7. The peak comes during the midday hours, soaring to a high of 12 at 12:00, signaling a need for protection against harmful rays. The index gradually declines in the afternoon, falling to 9 at 14:00 and then tapering off to 6 by 15:00. As the sun sets, the index drops further, reaching 2 at 17:00, then a safe 1 by 18:00, and finally settling at 0 after 19:00. Plan your day wisely, especially during those peak hours, to enjoy the sunshine while staying safe!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, with the highest risk months occurring from March to August, where it often reaches extreme levels. Notably, April, May, June, July, and August all register a UV Index of 12, indicating critical exposure levels with a burn time of only 10 minutes. Visitors and residents should take precautions during these months, such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours. Conversely, from January to February and October to November, the UV levels are lower, categorized as moderate to high, allowing for a more comfortable outdoor experience, although caution is still advised. In December, the UV Index drops back to 4, reverting to a moderate category where burn time extends to 30 minutes, making it the safest month for outdoor activities. Overall, awareness of the UV Index can help individuals protect themselves from harmful sun exposure year-round.
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 |
| 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 |
| Kushimoto | 4 | 6 | 9 | 11 | 11 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |