Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Gosen, Japan, where climate conditions can lead to significant sun exposure. With rising UV levels throughout the day, particularly peaking between 10:00 AM and 2:00 PM, awareness is key to preventing sunburn and safeguarding skin health. In a Cfa climate such as Gosen's, characterized by humid summers, residents are at an increased risk of harmful UV rays. Stay informed about the UV Index to enjoy the outdoors while protecting your skin from excessive damage!
The UV Index for today peaks dramatically as the sun rises, beginning at a modest 2 at 07:00. The intensity quickly escalates, reaching 4 by 08:00 and soaring to 7 by 09:00. By 10:00, the index hits 9, and it reaches its zenith at 11:00 and 12:00, both clocking in at an impressive 10—indicating a high risk of harm from unprotected sun exposure. As the afternoon progresses, the index gradually declines, dipping to 9 at 13:00, then sliding to 7 at 14:00. By 15:00, it reduces to 4, and as the day winds down, the index falls to 2 at 16:00, and further to 1 by 17:00 and 18:00, before settling at a safe 0 by 19:00. Remember, it’s crucial to protect your skin during the peak hours when the UV Index is at its highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | 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 | 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 |
| Gosen | 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 |