Last updated: June 2, 2025
Understanding the UV Index is vital for residents and visitors of Tsurusaki, Japan, where the climate can significantly elevate sun exposure risks. With a typical climate classified as Cfa, Tsurusaki experiences high UV levels, particularly during midday, peaking at an intensity of 11 between 11:00 AM and 1:00 PM. Knowing these levels is crucial not only for preventing painful sunburns but also for protecting long-term skin health. Stay informed and take the necessary precautions to enjoy the beautiful, sunny days that Tsurusaki has to offer while keeping your skin safe!
As the day unfolds, the UV Index reaches its peak during the late morning and early afternoon hours. Starting at a modest 2 by 07:00, the intensity steadily climbs, hitting 3 by 08:00 before surging to 6 by 09:00. The sun truly asserts itself around 10:00, where the index soars to 8, and by 11:00, it hits a striking 11—the maximum for the day. This intense UV exposure remains consistent until 13:00, when conditions maintain an index of 11. Gradually, the UV rays start to wane, dropping to 9 by 14:00, then further declining to 6 at 15:00. In the late afternoon and evening, the index recedes to 4 at 16:00, followed by 2 at 17:00, tapering off to a gentle 1 by 18:00 and 19:00. It's a perfect reminder to stay vigilant about sun protection during those 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 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 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 emerging from March to September. During this period, the UV Index peaks at 12, indicating an extreme exposure category from May to August, requiring only 10 minutes of sun exposure before risking skin damage. Conversely, January and December feature a moderate UV Index of 4, allowing for about 30 minutes of safe exposure. Visitors and residents are advised to take extra precautions during high-risk months, such as wearing sunscreen, protective clothing, and seeking shade during peak hours, particularly in the summer months when the potential for sunburn is acute. As the UV Index starts to decline in October and November, a return to more moderate sun safety measures becomes appropriate.
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 |
| Tsurusaki | 4 | 6 | 9 | 11 | 12 | 11 | 12 | 12 | 11 | 7 | 6 | 4 |