Last updated: July 2, 2025
In Katashina, Japan, being aware of the UV Index is crucial for safeguarding your skin from harmful sun exposure. Understanding the UV levels can help you prevent sunburn and promote long-term skin health, essential in a region where high UV indices can be observed, particularly during midday hours. With a Dfb climate that experiences clear skies and increased sun exposure, local residents and visitors alike should remain vigilant, especially when UV levels peak at 11 between 11:00 AM and 1:00 PM. Stay informed and protect yourself as you enjoy the beautiful landscapes of Katashina!
The UV Index throughout the day reveals a dramatic rise in sun intensity, peaking at 11 around 11:00 AM and 12:00 PM. Starting from 07:00 AM with a low of 2, the index escalates rapidly, reaching 10 by 10:00 AM. As the sun climbs higher, it delivers its harshest rays, prompting caution for those outdoors. From 1:00 PM onward, the index gradually declines, hitting 5 at 3:00 PM, and finally tapering off to 0 by 7:00 PM. This profile highlights the importance of sun protection during the midday hours when UV exposure is most intense. Stay safe and protect your skin! 🌞
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
As the seasons change, so does the UV Index, which is crucial for both visitors and residents to monitor for sun safety. January starts with a moderate UV Index of 4, allowing for a burn time of 30 minutes, but by February, the index rises to 6, categorized as high, with a shorter burn time of 25 minutes. The peak UV exposure occurs from March through August, reaching an extreme UV Index of 11, where just 10 minutes of unprotected sun exposure can lead to burns. April and May hold particularly high risks, with values of 10 and 11, respectively. Although the risk decreases in September to 10 (very high) and October to 7 (high), caution is still necessary. By November and December, the UV Index falls back to 5 and 3, categorized as moderate, allowing for 30 minutes of exposure. It is essential for all to use sunscreen and protective clothing, especially during the high-risk months of March through August, to minimize skin damage while enjoying outdoor activities.
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 |
| Katashina | 4 | 6 | 9 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |