Last updated: July 2, 2025
In Chuo, Japan, being aware of the UV Index is crucial for maintaining healthy skin and preventing painful sunburns. Understanding UV levels empowers residents and visitors to take appropriate precautions during the day, especially when the index peaks—reaching a maximum of 12 between 11:00 AM and 12:00 PM. With Chuo's Dfb climate, characterized by warm summers and cold winters, it’s essential to recognize that even moderate UV exposure can pose risks to skin health. Stay informed and protect yourself from harmful rays to enjoy all the outdoor beauty this vibrant district has to offer!
The UV Index paints a vivid picture of the sun's intensity throughout the day. Early risers will find a gentle start at 7:00 AM with a mild UVI of 2, but as the sun climbs higher, the intensity sharply rises to 8 by 9:00 AM and peaks at a striking 12 between 11:00 AM and 12:00 PM. This aggressive UV exposure begins to taper off in the afternoon, dropping to 6 by 3:00 PM and continuing to diminish as the sun sets, with a final UVI of 0 by 7:00 PM. To stay protected during the peak hours, enjoying the outdoors between 10:00 AM and 2:00 PM requires caution—it's the sun’s strongest embrace!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | 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 |
| Chuo | 4 | 7 | 9 | 10 | 11 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |