Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Yasuda, Japan, where the risk of harmful UV exposure can peak throughout the day. With a climate characterized by warm summers, it’s essential to be informed about UV levels to prevent sunburn and protect skin health. During the summer months, UV Index values can reach as high as 12 at noon, signaling a significant risk for skin damage. By staying aware of these levels, you can enjoy the sun safely while minimizing long-term skin health issues. Remember, a little caution goes a long way in safeguarding your skin in this beautiful region!
The UV index shows a striking pattern throughout the day, starting off at a mild 2 at 07:00 and gradually climbing to a peak of 12 by noon. As the morning warms, it reaches an energetic 9 at 10:00, then surges to its maximum intensity of 11 at 11:00 before hitting 12 at 12:00, urging sunbathers and outdoor enthusiasts to take precautions. The afternoon sees a gentle decline, with the UV index slipping back to 9 at 14:00 before tapering to 6 and finally dropping to 2 by 17:00. As night approaches, the UV exposure diminishes dramatically, resting at 0 by 19:00. Embrace the sunshine early, but remember to seek shade and protect your skin during the 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 | 3 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, seasonal UV Index changes highlight significant variations in sun exposure risks. The high-risk months are from March to August, where the UV Index reaches its peak at 12, indicating an extreme exposure category. During these months, the burn time is notably short—only 10 minutes, underscoring the need for heightened sun protection. In contrast, January and December present a moderate risk with UV Index values of 4, allowing for safer exposure of up to 30 minutes. As such, residents and visitors should specifically take precautions between March and August, including wearing sunscreen, protective clothing, and staying in shaded areas during peak sun hours to minimize harmful UV effects.
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 |
| Yasuda | 4 | 6 | 9 | 11 | 12 | 12 | 12 | 12 | 10 | 8 | 6 | 4 |