Last updated: May 3, 2025
Understanding the UV Index in Nihommatsu, Japan, is crucial for protecting your skin health and preventing sunburn. As a city nestled in a Cfa climate zone, Nihommatsu experiences varying UV exposure levels throughout the day, with peaks reaching up to 10 between 11 AM and 1 PM. Being aware of these levels not only helps you plan outdoor activities safely but also promotes long-term skin health by minimizing harmful UV exposure. Stay tuned to daily UV forecasts to ensure you’re prepared for the sun’s intensity and enjoy the beautiful weather without worry!
As the sun rises, the UV Index begins its ascent, starting at a mild 3 at 07:00. By 08:00, it reaches a moderate 5, urging early risers to consider sun protection. The index surges to an impressive 9 by 10:00, peaking at an intense 10 from 11:00 to 12:00, marking the day’s most hazardous time for skin exposure. As the sun slowly descends, the UV intensity begins to decline, dropping to 6 at 14:00 and further easing to 4 by 15:00. After this point, the UV Index dwindles to 2 by 16:00, and finally descends to 1 by 17:00, where it languishes until the day fades at 19:00 with a safe 0. Stay sun savvy; peak hours demand caution!
| 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 | 6 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
As the seasons change, so does the UV Index, which measures the strength of ultraviolet radiation. January and December start the year with a moderate UV Index of 3, allowing for a safer 30-minute exposure without significant risk. Moving into February, the index rises to 5, maintaining a moderate level, but caution is advised. By March, the UV Index escalates to 7 (high), warning of a 25-minute burn time. The most critical months for UV exposure are April through August, where the UV Index peaks at 11 (extreme), significantly lowering burn times to just 10 minutes in June, July, and August. September sees a drop to 9 (very high) with a 15-minute burn time, while October and November return to moderate levels, with indices of 6 and 5 respectively, allowing for longer exposure again. Therefore, visitors and residents should take precautions, particularly from April through August, using sunscreen, wearing protective clothing, and seeking shade to minimize UV exposure during these high-risk months.
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 |
| Nihommatsu | 3 | 5 | 7 | 9 | 10 | 11 | 11 | 11 | 9 | 6 | 5 | 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 |