Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Yasugi, Japan, as it plays a significant role in sunburn prevention and maintaining skin health. With the region's Cfa climate, characterized by hot summers and moderate seasons, UV exposure can fluctuate throughout the day, peaking sharply around midday. At its highest, the UV Index in Yasugi can reach an intense level of 11, indicating a very high risk of harm from unprotected sun exposure. By staying informed about the daily UV levels, you can take proactive steps to protect your skin and enjoy the beautiful outdoors safely.
The UV Index begins its climb at 07:00 with a mild 2, gradually escalating to a peak of 11 at 12:00. As the sun reaches its zenith, so does the intensity of ultraviolet rays, making this the most critical time for sun safety. From 13:00, the index gradually descends, dropping to 6 by 15:00, then tapering off further to 4 at 16:00. As evening approaches, the UV levels decrease significantly, settling at 2 by 17:00, and then dwindling to a minimal 1 after 18:00. To sum up, it's crucial to take protective measures during the midday hours when the UV Index peaks, ensuring you're shielded from harmful rays.
| 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 | 8 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 6 | 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 experiences significant fluctuations, with the highest risk months typically from April to August, when values peak at 11-12 and fall into the extreme exposure category. Notably, July and August record the highest UV levels, necessitating diligent sun protection strategies. In contrast, the lower risk period spans from November to February, where the UV Index varies between 3 and 6, indicating moderate to high exposure. Visitors and residents are advised to take extra precautions during the high-risk months by seeking shade, wearing protective clothing, and applying sunscreen regularly to minimize the risk of 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 |
| Yasugi | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 12 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |