Last updated: June 2, 2025
Understanding the UV Index in Kajiki, Japan is crucial for protecting your skin and overall health. As the UV levels can reach a high of 12 during peak hours, it’s important to be vigilant about sun exposure to prevent painful sunburns and long-term skin damage. Kajiki’s Cfa climate means warm, humid summers with elevated UV radiation. By staying informed about the UV Index, you can take proactive measures, ensuring that your outdoor activities remain enjoyable and safe, while safeguarding your skin from harmful UV rays.
As the sun rises, the UV Index begins its ascent, starting at a modest 2 at 07:00. By 08:00, it reaches 3, signaling the start of a day filled with increasing sun intensity. The index climbs to 6 by 09:00, peaking dramatically at 12 during noon. Between 11:00 and 13:00, the UV Index hovers around a remarkable 11, emphasizing the need for protection against the sun’s rays. As the afternoon rolls on, values gradually decline, settling at 9 by 14:00 and then tapering off to 7 at 15:00. By late afternoon, the index drops to 4 at 16:00 and continues its descent to 1 by the evening, reminding us of the dynamic nature of sunlight throughout the day. Stay informed and protected during the peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 8 | 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 | 7 | high | 25 min |
| 16:00 | 4 | 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 fluctuates significantly, indicating varying levels of sun exposure risk. From January to February, the index increases from 5 (moderate risk) to 6 (high risk), suggesting a gradual need for sun protection. As spring approaches in March and April, the index peaks at 10 (very high risk), requiring increased caution. The summer months of May, June, July, and August reach their highest levels at 12 and 13 (extreme), with only 10 minutes of sun exposure before burning occurs. Although the UV index slightly decreases in September (11) and October (8), it remains high, continuing to warrant protective measures. The year concludes with a return to moderate levels in November (6) and December (5). Visitors and residents are advised to prioritize sun safety during the high-risk months from March through October, utilizing sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of sunburn and long-term skin damage.
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 |
| Kajiki | 5 | 6 | 10 | 10 | 12 | 12 | 12 | 13 | 11 | 8 | 6 | 5 |