Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors of Noboribetsu, Japan, where exposure to solar radiation can significantly impact skin health. With typical UV levels peaking between 10 AM and 2 PM, knowing the daily fluctuations in UV exposure is essential for sunburn prevention and long-term skin protection. Noboribetsu, located in a Dfb climate zone, experiences varying UV intensity throughout the year, making it vital to stay informed. On brighter days, the UV Index can reach values as high as 10—indicating a very high risk of harm from unprotected sun exposure. Empower yourself with knowledge to enjoy outdoor activities safely while safeguarding your skin!
As the sun rises, the UV Index begins to climb steadily, starting at a mild 3 by 07:00. By 09:00, it hits a noticeable 7, urging early risers to take precautions. The peak occurs at 12:00, reaching a striking 10, marking the day's most intense exposure. As the afternoon progresses, the index gradually declines, dipping to 7 by 14:00 and then further to 5 at 15:00. By 16:00, it begins its descent, dropping to a gentle 3 and finally stabilizing at a low 1 by 17:00 onwards. It's a reminder that while midday sun can be powerful, the evening brings solace with its reduced UV levels. Stay protected when UV rays are at their highest, especially during mid-day!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 9 | 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 | 1 | low | 45 min |
Throughout the year, the UV Index demonstrates significant seasonal variations that highlight the importance of sun safety. From January to March, the UV levels are generally low to moderate, with burn times ranging from 30 to 45 minutes. However, April marks the start of high-risk months, peaking with May and August, where the UV Index reaches a very high level of 9 and 10, drastically reducing safe sun exposure to just 15 minutes. Following these months, September and October maintain elevated UV levels before returning to more moderate levels in November and December. Residents and visitors are strongly advised to take precautions during high-risk months (April through September) by wearing sunscreen, protective clothing, and seeking shade during peak sun hours to minimize the risk of skin 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 |
| Noboribetsu | 2 | 3 | 5 | 7 | 9 | 10 | 9 | 10 | 8 | 6 | 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 |