Last updated: July 2, 2025
Understanding the UV Index in Yonakuni, Japan is essential for safeguarding your skin and overall health. With levels peaking at a striking 13 around noon, awareness of UV exposure can help you prevent painful sunburns and long-term skin damage. Located in a Cfa climate zone, Yonakuni enjoys warm summers, making it imperative to stay informed about daily UV levels. Whether you're lounging on the beach or exploring the beautiful landscapes, knowing the UV Index ensures you can enjoy the sun safely and responsibly.
The UV Index for today reveals a striking pattern of sun intensity throughout the day. Starting at 7:00 AM, the index is a modest 1, but as the sun rises, so does the intensity—by 10:00 AM, it skyrockets to 7. The peak arrives at noon and 1:00 PM with a blistering 13, indicating a crucial time to protect your skin. As the afternoon progresses, from 2:00 PM to 3:00 PM, the index remains high but begins to taper off, dropping to 9 by 3:00 PM. The gentle decline continues into the evening, with UV levels plummeting to 1 by 6:00 PM and holding steady until sunset. Be mindful of the midday sun—it’s when the rays are most potent and protection is essential.
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 1 | low | 45 min |
08:00 | 2 | low | 45 min |
09:00 | 4 | moderate | 30 min |
10:00 | 7 | high | 25 min |
11:00 | 11 | extreme | 10 min |
12:00 | 13 | extreme | 10 min |
13:00 | 13 | extreme | 10 min |
14:00 | 12 | extreme | 10 min |
15:00 | 9 | very high | 15 min |
16:00 | 6 | high | 25 min |
17:00 | 3 | moderate | 30 min |
18:00 | 1 | low | 45 min |
19:00 | 1 | low | 45 min |
The UV Index exhibits significant seasonal variation, peaking in the summer months from March through August where it reaches an extreme level of 13, with a burn time of just 10 minutes. These months are the most critical for skin exposure, categorizing them as high-risk for sunburn. January and February begin with very high levels of 8 and 10, respectively, suggesting that even early in the year, precautions are necessary. As fall arrives, the UV Index decreases, dropping to 10 in October and 9 in November, before settling at a high level of 7 in December with a longer burn time of 25 minutes. Visitors and residents are advised to protect their skin by applying sunscreen, wearing protective clothing, and limiting sun exposure, especially during the high-risk months of March to September.
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 |
Yonakuni | 8 | 10 | 12 | 13 | 13 | 13 | 13 | 13 | 12 | 10 | 9 | 7 |