Last updated: June 2, 2025
In Hachinohe, Japan, staying aware of the UV Index is crucial for safeguarding your skin against harmful radiation. Understanding UV levels not only helps in preventing painful sunburns but also plays a pivotal role in long-term skin health and reducing the risk of skin cancers. Hachinohe, with its Dfb climate, experiences significant UV exposure, especially during peak sunlight hours—reaching a maximum UV index of 10 around midday. By keeping an eye on the UV Index, residents and visitors can enjoy outdoor activities safely and effectively protect their skin from the sun's rays.
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 |
Throughout the year, UV radiation levels experience significant seasonal variation, peaking during the summer months. January and December have a low UV Index of 2, allowing for an extended burn time of 45 minutes. However, as early as February, the UV Index rises to 3 (moderate), reducing the burn time to 30 minutes. March introduces a high risk with a UV Index of 6, and by April and May, it escalates to 8 and 9 respectively, both categorized as very high, with a critical burn time of just 15 minutes. The peak occurs in August, where the UV Index reaches an extreme level of 11, permitting only 10 minutes of exposure before risking sunburn. As we transition into fall, the UV levels moderate slightly, but September remains high at 9, before dropping back to a high index of 6 in October. As a precaution, visitors and residents should prioritize sun protection from March through September, particularly during the summer months when the risk of harm is greatest, and always use sunscreen, wear protective clothing, and seek shade during peak hours.
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 |
| Hachinohe | 2 | 3 | 6 | 8 | 9 | 10 | 10 | 11 | 9 | 6 | 4 | 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 |