Last updated: May 3, 2025
Understanding the UV Index in Kofu, Japan is crucial for residents and visitors alike, as it serves as a key indicator of ultraviolet radiation levels that can impact skin health. With a climate classified as Dfb, Kofu experiences significant UV exposure, especially during the midday hours when the index peaks at 11. This highlights the importance of being aware of daily UV levels to prevent sunburn and long-term skin damage. By keeping an eye on the UV Index, you can make informed decisions to protect your skin while enjoying the beautiful outdoors in Kofu.
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 |
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 |
| Kofu | 4 | 7 | 9 | 10 | 11 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |