Last updated: July 2, 2025
Understanding the UV Index in Kamaishi, Japan, is essential for maintaining your skin health and preventing sunburn, especially as the city experiences moderate UV exposure due to its temperate climate. With peak UV levels reaching 10 around midday, it’s crucial for residents and visitors alike to be aware of the potential risks related to overexposure. By comprehending daily UV fluctuations, you can make informed decisions about sun protection, ensuring that your time outdoors remains enjoyable and safe. Keep an eye on the UV Index and protect your skin to fully embrace the beautiful outdoor offerings of Kamaishi!
During the day, the UV Index experiences a dynamic shift, peaking in the late morning. Starting at 3 at 07:00, it escalates to reach a high of 10 by 11:00 and remains there until 12:00. As afternoon approaches, the index gradually declines, dropping back to 9 by 13:00, then to 7 at 14:00. By the mid to late afternoon, it continues its descent, falling to 5 at 15:00 and further down to 3 by 16:00. In the evening, the index diminishes significantly, plummeting to 1 at both 17:00 and 18:00, and finally reaching 0 by 19:00. This pattern highlights the importance of sun protection during the peak hours of 10:00 to 12:00 when the UV radiation is most intense.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 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 |
As the seasons change, so do the UV Index levels, indicating varying levels of sun exposure risk throughout the year. From January to February, the UV Index remains moderate (3 to 4), with a burn time of 30 minutes. However, March marks the beginning of high-risk months, as the index rises to 6 (high) with a reduced burn time of 25 minutes. April sees a significant jump to 8 (very high), while May peaks at 9, both months requiring protective measures within 15 minutes of sun exposure. The summer months of June and July are especially concerning, with June reaching an extreme UV Index of 11 and July at 10, where a brief 10 to 15 minutes can lead to burns. Throughout August and September, the index remains high (10 and 9 respectively), before declining in October to a more manageable 6 (high) and returning to moderate levels in November and December. Visitors and residents alike should exercise caution, especially during the late spring and summer months, by wearing protective clothing, using sunscreen, and seeking shade to minimize UV 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 |
| Kamaishi | 3 | 4 | 6 | 8 | 9 | 11 | 10 | 10 | 9 | 6 | 4 | 3 |
| 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 |