Last updated: July 2, 2025
Understanding the UV Index is vital for residents and visitors in Nagata, Japan, where the subtropical Cfa climate brings intense sunlight, especially during the summer months. High UV levels can lead to sunburn and long-term skin damage, making it essential to be aware of daily UV exposure risks. With a peak UV Index of 13 around noon, it's crucial to stay informed and take protective measures to safeguard your skin health throughout the day. Explore the UV patterns to enjoy the outdoors safely while reveling in all that Nagata has to offer!
The UV Index shows a dramatic rise throughout the morning, starting at a mild 1 at 07:00 and escalating to 3 by 08:00. As the sun climbs higher, the index reaches a peak of 13 at 12:00, signaling a level of exposure that calls for protective measures. Intensity slightly decreases in the afternoon, dropping to 10 at 14:00 and 8 at 15:00, before gradually declining to a safe 1 by 19:00. Overall, the day presents a clear warning for outdoor activities, emphasizing the need for sunscreen and shade during the midday hours when UV radiation is at its strongest. Stay protected!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 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 |
Throughout the year, the UV Index exhibits significant seasonal variations, with the highest risks occurring between March and September. During this period, particularly in June, July, and August, the UV Index reaches its peak at 13, indicating extreme exposure levels with a burn time of just 10 minutes. Conversely, the UV levels are generally moderate in January and December (UV Index 5) and high in February and November (UV Index 7), where burn times extend to 25-30 minutes. Residents and visitors are strongly advised to take precautionary measures, especially from March to September, by seeking shade, wearing protective clothing, and applying sunscreen, to reduce the risk of skin damage from UV radiation.
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 |
| Nagata | 5 | 7 | 10 | 11 | 12 | 12 | 13 | 13 | 11 | 8 | 7 | 5 |