Last updated: June 2, 2025
Understanding the UV Index in Nanao, Japan, is essential for maintaining optimal skin health and preventing sunburn during outdoor activities. With Nanao’s Cfa climate, residents and visitors are often exposed to varying levels of UV radiation throughout the day, peaking around midday with an impressive index of 11. Recognizing these levels empowers you to take necessary precautions, safeguarding your skin against potential damage and ensuring enjoyable, sun-safe experiences. Be mindful of the UV Index to effectively plan your activities, particularly when levels soar, and protect your skin from the sun's harmful effects!
As the sun rises, the UV Index begins its ascent, starting at a gentle 2 at 07:00. By 08:00, it climbs to 4, indicating a slight increase in UV exposure. The intensity peaks at 12:00, reaching a striking 11, suggesting that midday is the most hazardous time for unprotected skin. Afterward, the index gradually declines, dipping to 6 by 15:00 and falling further to 1 by 19:00, when the sun begins its descent. This hourly data underscores the importance of sun protection, especially during the critical hours from 10:00 to 14:00 when the UV levels are at their highest. Stay safe and make the most of the sunny hours!
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 | 11 | extreme | 10 min |
13:00 | 10 | very high | 15 min |
14:00 | 8 | very high | 15 min |
15:00 | 6 | high | 25 min |
16:00 | 3 | moderate | 30 min |
17:00 | 2 | low | 45 min |
18:00 | 1 | low | 45 min |
19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal changes, with high-risk months occurring from March to September. During this period, the UV Index escalates from moderate levels of 3 in January and February to extreme levels of 11 in June, July, and August. The burn time dramatically decreases, from 30 minutes in January and February to just 10 minutes in the peak summer months. Visitors and residents are strongly advised to take proper precautions during the high-risk months by applying sunscreen, wearing protective clothing, and limiting sun exposure, especially between 10 AM and 4 PM when UV radiation is at its peak. After September, the UV Index begins to decline, but vigilance is still recommended through October.
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 |
Nanao | 3 | 4 | 7 | 10 | 10 | 11 | 11 | 11 | 9 | 7 | 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 |