Last updated: May 3, 2025
Understanding the UV Index is crucial for residents of Nonoichi, Japan, where the subtropical Cfa climate brings distinct seasonal variations and notable sun exposure. With UV levels peaking at a significant 10 during midday, being aware of these ratings is essential for preventing sunburns and safeguarding long-term skin health. As the sun's intensity varies throughout the day, recognizing the risks associated with high UV levels can help you take appropriate measures, ensuring your outdoor activities remain enjoyable and safe. Stay informed and protect yourself from the sun, especially during those peak hours when UV radiation is at its strongest!
The UV Index paints a vivid picture of the sun’s intensity throughout the day. At sunrise (07:00), the index starts modestly at 2, but by 08:00, it rises to a comfortable 4. The sun gains strength, with readings escalating to 6 by 09:00. The peak arrives at 11:00 and 12:00, where the index reaches a striking 10—a clear signal to seek shade or apply sunscreen! As the afternoon progresses, we see a decline; the UV Index drops to 9 at 13:00 and gradually decreases to 5 by 15:00. The late afternoon brings a gentle taper off to 3 by 16:00, before plummeting to 1 by 17:00 and finally settling at 0 as evening descends (19:00). Stay sun-smart and enjoy the daylight safely!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 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 |
The UV Index experiences significant seasonal fluctuations, peaking from March to August. During this period, particularly in June, July, and August, the UV Index reaches an extreme level of 11, indicating a burn time of only 10 minutes. March and April also present high risks with UV indexes of 8 and 10 respectively, categorized as very high. Conversely, January, February, November, and December see moderate levels, with burn times of around 30 minutes. Visitors and residents are advised to take precautions, especially during the high-risk months of March through September, such as wearing protective clothing, using sunscreen, and seeking shade to minimize UV exposure and potential sunburn.
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 |
| Nonoichi | 4 | 5 | 8 | 10 | 10 | 11 | 11 | 11 | 9 | 7 | 5 | 3 |
| 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 |