Last updated: July 2, 2025
In Fukushima, Japan, being aware of the UV Index is crucial for protecting your skin from harmful ultraviolet radiation. Understanding UV levels can help prevent sunburn and promote long-term skin health, making it essential for everyone, especially during the peak of summer. With a Dfa climate, Fukushima experiences varied UV exposure throughout the year. For instance, UV Index values peak at 10 around noon, indicating a high risk for skin damage without adequate protection. Stay informed to enjoy the beauty of Fukushima while keeping your skin safe!
As the sun rises, the UV Index begins its steady ascent, starting at a modest 2 by 7:00 AM. By 8:00 AM, it climbs to 4, signaling the start of a more intense day. The index peaks at a striking 10 between 11:00 AM and 12:00 PM, indicating the highest levels of ultraviolet radiation and highlighting the need for sun protection. As the afternoon unfolds, the UVI gradually declines from 9 at 1:00 PM to 5 by 3:00 PM, before retreating to a low of 1 by 5:00 PM and remaining stable through the evening. This hourly progression not only reflects the sun's power but also serves as a reminder to stay vigilant and protect your skin during the peak hours of exposure.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | 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 | 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 experiences significant fluctuations, with the most intense levels occurring during the summer months. From April to August, the index rises sharply, peaking at 11 in August, which falls into the extreme exposure category. Consequently, April through September are considered high-risk months for UV exposure, with burn times decreasing to as little as 10-15 minutes during this period. Residents and visitors are strongly advised to take precautions by wearing sunscreen, protective clothing, and hats, especially during midday hours when the sun's rays are most intense. Conversely, during the winter months of December through February, the risk is considerably lower, with the UV Index ranging from 2 to 4 and longer burn times of 30-45 minutes, allowing for more outdoor activities with reduced risk.
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 |
| Fukushima | 3 | 4 | 5 | 8 | 9 | 10 | 10 | 11 | 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 |