Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Nirasaki, Japan, where the sun can be deceptively intense. With a climate classified as Dfb, Nirasaki experiences seasonal variations that can significantly impact UV exposure levels throughout the year. As midday UV Index readings soar to a peak of 12, awareness of these levels is essential for preventing sunburn and protecting your skin health. By paying attention to the UV Index, you can enjoy outdoor activities while minimizing the risk of skin damage and other sun-related health issues. Stay informed and stay safe under the sun!
The UV Index today starts off relatively mild, peaking at 3 by 07:00. As the sun rises higher, the intensity escalates to 5 at 08:00, reaching a significant 8 by 09:00. The intensity continues to climb and hits a maximum of 12 at 12:00, prompting caution for outdoor activities. 11 at 11:00 and 10 at 13:00 keep the UV levels high, before they start to taper off. By 15:00, it drops to 6, then quickly declines to 3 by 16:00. The sun's retreat is apparent as the index falls to 2 at 17:00 and ultimately settles at a low 0 by 19:00, making the evening hours safe for all. Stay sun-smart and protect your skin during peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | 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 | 0 | low | 45 min |
Throughout the year, the UV Index demonstrates significant seasonal variations, highlighting the importance of sun protection during peak months. From March to August, the UV Index reaches its highest levels, peaking at 12 in June, July, and August, which falls under the extreme exposure category with a burn time of just 10 minutes. This indicates that March through August are the high-risk months for UV exposure, particularly April and May, which see indices of 10 and 11 respectively. Residents and visitors are advised to take extra precautions during these months, including wearing sunscreen, protective clothing, and seeking shade, especially during the midday hours. As the year progresses into the autumn and winter months, UV levels decrease, but awareness should still be maintained in February, October, and November, where the UV Index remains in the high range.
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 |
| Nirasaki | 4 | 7 | 9 | 10 | 11 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |