Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Kameshima, Japan, where sunshine is abundant due to its temperate Cfa climate. As UV levels can peak dramatically, especially with a maximum index of 11 around noon, being aware of these levels helps prevent sunburn and protects skin health. With the island’s typical exposure risks, especially from late morning to early afternoon, staying informed can make all the difference in enjoying the outdoors safely while safeguarding your skin from harmful UV rays.
The UV Index today shows a clear peak during the midday hours, highlighting the importance of sun safety. At 07:00, the index starts low at 2, making it a gentle introduction to the day. As the sun climbs higher, the index rises steadily, reaching 4 at 08:00, and then jumps to 6 by 09:00. The real intensity hits at 10:00 with a reading of 8, climbing to a maximum of 11 at 12:00, which is considered very high. As the afternoon progresses, the levels gradually decline, falling to 10 at 13:00 and then dropping to 8 at 14:00. By the time the clock strikes 15:00, it slips to 5, before tapering off to 3 by 16:00. The UV intensity diminishes further as evening approaches, with readings of 1 at both 17:00 and 18:00, finally reaching 0 by 19:00. Stay sun-smart during those peak hours!
| 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 | 8 | very high | 15 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, UV levels show significant seasonal variation, peaking during the late spring and summer months from May to August, when the UV Index reaches extreme levels of 11, indicating a burn time of just 10 minutes. The high-risk months for sun exposure are May, June, July, and August, when it’s essential for residents and visitors to take precautions such as wearing protective clothing, applying sunscreen, and seeking shade during peak sunlight hours. In contrast, January, February, November, and December present a lower risk with moderate UV Index levels, allowing more time for safe sun exposure (up to 30 minutes). As UV levels begin to drop in the fall months, particularly in October, it's still wise to maintain sun safety practices, especially as the index remains relatively high.
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 |
| Kameshima | 4 | 5 | 8 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| 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 |