Last updated: June 2, 2025
Understanding the UV Index is crucial for the residents of Saito, Japan, where the warm, humid climate can lead to significant sun exposure. As UV levels can peak as high as 12 around midday, being aware of these levels is vital for sunburn prevention and maintaining skin health. With such intense sunlight, especially during the summer months, even short periods outdoors without protection can lead to harmful effects. By staying informed about the daily UV Index, you can enjoy the sunny days while also safeguarding your skin from potential damage.
As the day unfolds, the UV Index climbs steadily, peaking at a striking 12 around noon, signaling a high risk for skin damage without protection. Early risers at 07:00 encounter a mild 2, but the intensity increases quickly, reaching 9 by 10:00 and a critical 11 by 11:00. From 12:00 to 13:00, the index holds its highest point at 12, making it essential to seek shade or apply sunscreen. After 13:00, the UV levels gradually decrease, dropping back to a manageable 4 by 16:00 and winding down to a safe 1 by 18:00. This hourly data serves as a reminder to take sun safety precautions, especially during peak hours.
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 | 9 | very high | 15 min |
11:00 | 11 | extreme | 10 min |
12:00 | 12 | extreme | 10 min |
13:00 | 11 | extreme | 10 min |
14:00 | 9 | very high | 15 min |
15:00 | 6 | high | 25 min |
16:00 | 4 | moderate | 30 min |
17:00 | 2 | low | 45 min |
18:00 | 1 | low | 45 min |
19:00 | 1 | low | 45 min |
As the seasons change, so do the UV index levels, significantly affecting sun exposure and safety. Throughout the year, high-risk months generally occur from March to September, where the UV index peaks at 12, classified as extreme exposure, particularly during May through August. During these months, burn time is as short as 10 minutes, necessitating vigilant sun protection measures. Visitors and residents are urged to use sunscreen, wear protective clothing, and seek shade during peak hours to mitigate the risk of skin damage. In contrast, the UV index is lower in January, February, October, and November, where exposure is categorized as moderate to high; however, sunscreen remains advisable during all months to ensure skin health year-round.
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 |
Saito | 5 | 6 | 9 | 10 | 12 | 12 | 12 | 12 | 11 | 8 | 6 | 4 |