Last updated: May 3, 2025
In Kamiamakusa, Japan, being aware of the UV Index is essential for protecting your skin and overall health. Understanding the levels of ultraviolet radiation can help residents and visitors prevent sunburn and long-term skin damage, particularly during the peak hours when the UV Index reaches a staggering 12 around noon. The coastal climate in Kamiamakusa, characterized by its Cfa climate zone, often means heightened UV exposure, especially in summer, making it crucial to stay informed about daily UV levels. By staying vigilant and adjusting your outdoor plans according to the UV Index, you can enjoy the sun safely while minimizing the risks associated with harmful UV rays.
At dawn, the UV Index starts low at 1 around 07:00, making it a gentle introduction to the day. As the sun rises higher, the intensity increases rapidly, peaking at 12 by 12:00—perfect for sunbathers and outdoor enthusiasts seeking that golden glow. The midday sun commands attention, with values reaching 11 at 11:00 and 13:00, encouraging sun safety precautions. As the afternoon rolls in, the UV Index begins to wane, dropping to 9 at 14:00 and further to 4 by 16:00. By evening, the UV exposure diminishes significantly, settling back to 1 by 19:00, ushering in a gentle dusk. It’s essential to stay informed and safeguard against the sun’s rays, especially during those peak midday hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | 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 shows notable seasonal changes, with the highest risk occurring from March to September. During these months, the index reaches extreme levels, particularly peaking in August with a UV Index of 13. Visitors and residents should exercise caution during high-risk months and, ideally, limit direct sun exposure to less than 10 minutes daily between April and September. In contrast, the UV Index is relatively moderate in January and December, with burn times of 30 minutes. To minimize the risk of skin damage, it is essential to apply sunscreen, wear protective clothing, and seek shade, especially during peak hours from late morning to early afternoon.
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 |
| Kamiamakusa | 5 | 6 | 9 | 11 | 12 | 12 | 12 | 13 | 11 | 8 | 6 | 4 |