Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Ushibukamachi, Japan, especially considering its typically humid Cfa climate. As UV levels can soar to an intense 11 during midday, awareness of these fluctuations is vital for preventing sunburn and protecting overall skin health. The risk of harmful UV exposure heightens during peak hours, making it essential to stay informed about daily UV conditions. By keeping track of the UV Index, you can enjoy the beautiful outdoors while safeguarding your skin and wellbeing.
The UV Index data reveals a dynamic day of sun exposure, starting off gently at 07:00 with a low level of 1. As the day progresses, the intensity ramps up, peaking at 11 between 12:00 and 13:00—a time to be mindful of sun safety. The index gradually declines after that, dipping to 9 by 14:00 and continuing down to 2 by 17:00. By evening, the UV levels fall back to a mellow 1 at 18:00 and persist through 19:00. Overall, plan your outdoor activities accordingly, especially between 10:00 and 13:00, when UV levels are at their highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | 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 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV radiation levels show significant seasonal variation, with high-risk months identified primarily from March to September. The UV Index reaches its peak in August at 13, indicating an extreme exposure category with a burn time of just 10 minutes. In contrast, during the winter months of December and January, the Index drops to moderate levels of 4 and 5, with longer burn times of 30 minutes. Visitors and residents are advised to take precautions during the high-risk months by wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade to minimize sun exposure, especially during midday hours when UV radiation is strongest. As UV levels decrease in the fall and winter, awareness and protective measures can be relaxed somewhat, but some sun safety practices should still remain in place year-round.
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 |
| 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 |
| Ushibukamachi | 5 | 6 | 9 | 11 | 11 | 11 | 12 | 13 | 11 | 8 | 6 | 4 |