Last updated: July 2, 2025
In Tajimi, Japan, understanding the UV Index is crucial for safeguarding your skin health and preventing sunburn. With the region's Cfa climate, characterized by hot summers and potential high UV exposure, awareness of UV levels can significantly reduce your risk during peak hours, particularly when the index reaches a maximum of 12 around midday. By monitoring these levels, residents and visitors can take proactive measures to enjoy the beautiful outdoors while protecting their skin from harmful effects. Whether it’s planning outdoor activities or choosing the right sunscreen, staying informed about the UV Index is essential for a safe and enjoyable experience under the sun.
The UV Index for the day reveals a dynamic trajectory of sun intensity, peaking at 12 around noon. From the early hours, starting at 2 at 7:00 AM, the index climbs steadily, reaching 7 by 9:00 AM. As the sun reaches its zenith, the UV levels soar, hitting their maximum of 11 at 11:00 AM and remaining incredibly high at 12 from 12:00 PM to 1:00 PM. However, as the afternoon progresses, the index begins to decline, tapering down to 8 at 2:00 PM and further decreasing to 6 by 3:00 PM. By the evening, the UV Index drops significantly, settling back to 2 at 5:00 PM and finally waning to a calming zero by 7:00 PM. It's a day to stay sun-smart, especially during those peak midday 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 | 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 experiences significant seasonal changes, indicating varying levels of sun exposure risk. The high-risk months are from March to August, where the index reaches very high to extreme levels, peaking at 12 in July. During this time, burn times are dangerously short, ranging from 10 to 15 minutes. As such, visitors and residents are advised to take precautionary measures, including wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sunlight hours. In contrast, the winter months (December through February) see lower UV levels, with a moderate risk indicated by indices from 3 to 6, allowing for safer outdoor activities, though caution is still recommended.
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 |
| Tajimi | 4 | 6 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |