Last updated: August 1, 2025
Understanding the UV Index in Hachinohe, Japan is crucial for promoting skin health and preventing sunburn, especially during the peak summer months when UV levels can reach significant heights. Knowing when to seek shade or apply sunscreen can dramatically reduce risks associated with UV exposure. With a Dfb climate, Hachinohe experiences varied weather patterns, which can influence daily UV levels. For instance, the UV Index can soar to a maximum of 10 around noon, highlighting the importance of being vigilant about sun safety during outdoor activities. Stay informed and protect your skin!
The hourly UV Index paints a clear picture of the day's intensity from morning to evening. Starting at a mild 3 at 7:00 AM, the day warms up quickly, peaking at a robust 10 between 11:00 AM and 12:00 PM—the perfect time to seek shelter or apply sunscreen. After that fleeting high, the UV Index gradually declines, dropping to 4 by 3:00 PM and further diminishing to 1 by 5:00 PM. As the sun sets, the UV levels plummet to a safe 0 by 7:00 PM. This data underscores the importance of protecting your skin during peak hours, especially when the sun is at its strongest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 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 |